Shiomiya Yo

Biodata

Feature	Value
Name	Shiomiya Yo (四宫阳叶)
Alias(es)	Yoha
Species/Race	Human
Gender	Male
Affiliation	Hope's Peak Academy; Class D; Shinomiya Family
Occupation/Role	Student; observer and recorder of “humanoid life forms”
First Appearance	Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Wise Puppet	1	Received from the system’s beginner gift pack at age three. Grants extraordinary learning ability, but contributes to his disinterest in the outside world.
Hope's Peak Academy System activated	1	The formerly dormant system activates upon his arrival at the academy, offering points for tasks and talent draws.
Ultimate Lucky	2	Obtained through a system draw after earning 200 points from his first diary entry.
Ultimate Fighter	2	Obtained alongside Ultimate Lucky; significantly strengthens his body and fills his mind with fighting techniques.
Ultimate Detective	6	Obtained through a system draw; sharpens his observation and provides investigative knowledge and techniques.
Ultimate Pianist	6	Obtained through a system draw; grants performance techniques, compositions, greater hand dexterity, and the capacity to infuse emotion into music.
Ultimate Art Club Member	11	Obtained through a system draw; gives him artistic abilities that he enjoys exploring.
Talent-limit breakthrough quest	19	The system assigns Shiomiya a three-year task to break through the limits of his talents. 19
Ultimate Soldier	19	Obtained alongside Ultimate Analyst. Supplies military, shooting, tactical, and combat knowledge while comprehensively enhancing his neural reflexes, bone density, muscle fibers, and other physical attributes. 19
Ultimate Analyst	19	Obtained alongside Ultimate Soldier. Allows Shiomiya to process information at an extreme level, analyze behavioral patterns, and potentially predict future actions when given sufficient data. 19
Super High School-Level Magician	50	Obtained through a three-talent draw after a diary entry earns him 300 points. 50
Super High School-Level Fortune Teller	50	Obtained in the same draw as Magician and Swimmer. 50
Super High School-Level Swimmer	50	Obtained in the same draw as Magician and Fortune Teller. 50

Background / History

Shiomiya is a branch-family member of the Shinomiya Family. His exceptional intellect helped the family expand its assets, leaving him with considerable influence despite not belonging to its main line. He eventually became bored, left behind a development plan, and withdrew from further involvement. His parents died in an accident, further weakening his sense of purpose. 1 5

At age three, Shiomiya received a system and its beginner gift pack. The gifted Wise Puppet talent made him an extraordinary learner, but also left him increasingly detached from the world and driven by status and duty. The system then remained dormant for years. 1

As a child, he pursued increasingly destructive experiments out of boredom, including playing with weapons, setting fires, and blasting open a mountain. The Shinomiya and Koenji families concealed these incidents; no casualties occurred. 2

Shiomiya grew up alongside Koenji Rokusuke. After the pair were bullied during their first week of elementary school, Shiomiya led Koenji through combat training and then helped him defeat bullies across the school. Their reputation prevented further bullying for the rest of their seven years there. 9

He transferred schools in middle school, partly because he recognized that Koenji’s developing physical gifts had surpassed his own. He avoids explaining what happened during that period. 4 9

Appearance

Shiomiya is a young man whose chronic condition can leave him looking visibly haggard.

• His hair has white ends. 7
• He wears Hope's Peak Academy’s school uniform. 1
• During episodes, his world loses color and becomes grayscale; Kushida remains the sole vividly colored figure in his perception. 1 4
• On an outing with Kushida, he changes from his uniform into a simple black hoodie and casual pants, which make him appear more relaxed than usual. 54

Personality

Shiomiya is intensely curious about exceptional people and considers observing and categorizing them his main pastime. Ordinary people bore him, while unusual behavior, secrets, and conflict entertain him. He records notable people in his diary under provisional observation-file titles. 2 3 6

He is sarcastic, arrogant, and highly unconcerned with public opinion. Like Koenji, he is narcissistic and enjoys asserting dominance, though he mocks Koenji for the same trait. 1 4

Shiomiya is also manipulative and opportunistic. He exploits Kamuro’s shoplifting, Sakayanagi’s blackmail attempt, and Yamada Anna’s social anxiety to gain leverage or information. 5 7

Despite his detachment, he is emotionally unstable. Interruptions while he regulates his breathing can trigger episodes and uncontrolled outbursts. His developing emotions and inability to express them become especially painful after he gains the ability to play piano with feeling. 1 4 14

After struggling to paint a self-portrait, Shiomiya accepts that observing other people and finding amusement in their behavior is fundamental to his identity. He nevertheless develops greater self-awareness, including regret over his treatment of Yamada Anna. 18 49

His strengthened analytical ability initially makes ordinary life less enjoyable by forcing him to process every detail around him. He resolves this by filtering immediate information and placing the remainder into a mental “memory palace” for later analysis. 19

Abilities & Skills

System and God-Human Observation Diary

Shiomiya’s system awards points for observing and recording humanoid life forms. He spends these points on draws for talents. The diary is ordinarily stored in system space and cannot be seen by others. 1 2 11 15

• Creates organized observation files with a table of contents and automatic formatting. 2
• Earns points based on the evaluated quality of recorded events or individuals. 2 6 8 11
• Has recorded classmates including Hirata, Horikita, Kamuro, and Yamada. 2 3 6 8
• Keeps a personal file as a diary for recording his own experiences. 11
• Receives a three-year quest to break through the limits of his acquired talents. 19
• Earns 300 points from recording the events surrounding his confrontation with Yae Ogami, allowing him to perform another set of draws. 50

Extraordinary Learning

Through Wise Puppet, Shiomiya can rapidly master techniques and theory. He considers himself nearly omnipotent apart from physical limitations. 1 7

• Previously mastered numerous board games and defeated professional players and renowned masters. 6
• Learns martial arts styles readily and can perform techniques from many schools. 9
• Previously imitated emotionally expressive piano performances despite not understanding the feelings behind them. 7
• Has acquired practical massage techniques through repeated experience with professional treatments. 25

Ultimate Fighter

Ultimate Fighter strengthens Shiomiya physically and gives him extensive combat knowledge. 2

• Defeated multiple Class C students with precise elbow strikes during the grove brawl. 10
• Incapacitated Ryuuen Kakeru with a flying knee to the chest. 10
• Kicked open a locked rooftop door with a roundhouse kick. 4
• His stamina remains below Koenji’s despite his improved physique. 9
• Defeats three Class C attackers alone, using counters, elbow strikes, punches, and a flipping kick while deliberately avoiding lethal force. 28 29
• Throws Horikita Manabu to the ground after evading his kick. 30

Ultimate Detective

Ultimate Detective provides investigative expertise and substantially sharper observation. 6

• Identifies behavioral details and likely relationships, such as Horikita Suzune’s connection to Horikita Manabu. 3
• Tails Class C students into a surveillance blind spot. 9
• Selects Yamada Anna as an information source after assessing her circumstances and personality. 7
• Notices Kushida spying on his meeting with Sakayanagi. 13
• Detects inconsistencies in Hirata Yosuke and Karuizawa Kei’s apparent relationship. 28
• Investigates Sudo Ken’s group and uncovers its plan to use hidden cameras to spy on students. 60

Ultimate Pianist

Ultimate Pianist gives Shiomiya advanced piano technique, compositions, improved hand dexterity, and the ability to put emotion into his performances. 6

• His earlier playing was technically flawless but rigid and emotionally empty. 7
• His later performance deeply affects an upperclassman and Kushida, but triggers an emotional breakdown in Shiomiya himself. 14
• He struggles with the realization that talent alone has not changed his inner emptiness. 14
• Sings “Heroes’ Song” for Kushida in a KTV room. 57

Ultimate Art Club Member

Ultimate Art Club Member gives Shiomiya technical painting ability, sharper visual observation, better hand control, and imagination beyond merely replicating existing works. 11

• Experiments with painting and attempts a self-portrait, but feels unable to capture his genuine self. 18
• Receives unexpected encouragement from Aoi Morishita, who praises his painting and calls him the “Tin Man.” 19
• Begins to identify and accept a more personal artistic style. 19

Ultimate Soldier

Ultimate Soldier grants Shiomiya military knowledge and significantly enhances his body beyond the improvements supplied by Ultimate Fighter. 19

• Possesses knowledge related to combat, firearms, tactical analysis, and military operations. 19
• Gains enhanced reflexes, bone density, muscle strength, and sensory awareness. 19
• Becomes especially sensitive to surveillance and realizes that three Class C attackers likely intend to record their confrontation. 28
• Relies on superior reaction speed and evasion against professional boxer Yae Ogami, although her physical power still exceeds what he can endure directly. 49

Ultimate Analyst

Ultimate Analyst causes Shiomiya to unconsciously collect, integrate, and analyze information at an extraordinary rate. 19

• Predicts Yamauchi Haruki’s exact next line and movement from prior behavioral data. 19
• Can potentially analyze and forecast future events if given enough information. 19
• Regulates the ability by filtering incoming data and storing nonessential details within a mental memory palace. 19
• Locates Horikita Suzune in the library through deduction when Kushida orders him to introduce them. 20
• Identifies Ryuuen as the most likely source of rumors concerning his sales of school information. 27

Super High School-Level Magician

Shiomiya obtains Super High School-Level Magician through a system draw. 50

• Performs tricks that appear to produce items from nowhere, including a bottle that dispenses several different drinks before producing strawberry milk. 70
• Uses his skills to entertain and tease Kushida while refusing to explain the method behind his tricks. 70

Super High School-Level Fortune Teller and Swimmer

Shiomiya obtains Super High School-Level Fortune Teller and Super High School-Level Swimmer in the same draw as Magician. 50

• His interest in metaphysics and unusual phenomena becomes more pronounced after gaining Fortune Teller. 50
• No documented use of his Swimmer talent has yet been shown. 50

Chess and Strategy

Shiomiya is an elite chess player who enjoys strong opponents and treats games as tests of superiority. 6 12

• Defeats Sakayanagi Arisu in three consecutive rounds at the chess club. 12
• Uses solid defense, trap recognition, and positional destruction against Sakayanagi’s strategies. 12
• Trades information about hidden school rules and point distribution to Sakayanagi for 500,000 points. 13
• Establishes chess challenges in the school plaza as a source of points and influence. 39

Business and Information Brokerage

Shiomiya uses his knowledge of academy rules, student behavior, and the point economy to finance his extravagant lifestyle. 8 22

• Purchases a one-time viewing of first-year student records from Sae Chabashira for 50,000 points. 8
• Sells information concerning the academy’s anomalies and point system to Ichinose Honami for 500,000 points and Ryuuen for 400,000 points. 22
• Creates an electronic map of food establishments and shares it with Kushida and Class D. 39
• Obtains past midterm questions and quizzes by offering to pay for an upperclassman’s daily meals. 40
• Extorts 500,000 points from Horikita Manabu by threatening to release a recording of his treatment of Horikita Suzune. 30

Relationships

• Koenji Rokusuke — Childhood acquaintance, rival, and training partner. They grew up together, dominated their elementary school through fighting, and retain a competitive but caring bond. They resume morning training at the academy, although Koenji’s endurance remains superior. 1 9 10
• Kushida Kikyo — Former middle-school acquaintance with a volatile, deeply entangled relationship. She initially wants him expelled because he knows too much about her, while he is drawn to her unmasked personality and repeatedly becomes emotionally vulnerable around her. After exploiting ambiguous evidence from their night together to make him comply with her demands, Kushida publicly frames him as an unwanted pursuer; their dynamic later develops into an increasingly intimate but unstable relationship, including dates and mutual displays of affection. 3 4 14 17 18 53 57
• Sakayanagi Arisu — Class A student, chess rival, and information-trading partner. Shiomiya outmaneuvers her during the Kamuro incident, defeats her in chess, and sells her information regarding hidden rules and point distribution. 5 6 12 13
• Kamuro Masumi — Target of Shiomiya’s leverage after he records her shoplifting. He later records her as an “incomprehensible” individual and continues to involve her in his dealings with Sakayanagi. 5 6 12
• Yamada Anna — Second-year student whom Shiomiya manipulates into revealing academy rules and special-exam information; he later begins an “affinity-building plan” involving her. Her hurt feelings lead her friend Yae Ogami to confront him, prompting Shiomiya to express remorse and apologize. 7 8 49
• Ryuuen Kakeru — Class C opponent defeated by Shiomiya during the grove brawl. Shiomiya later sells him academy information, suspects him of spreading rumors against him, and is targeted by Class C students in apparent retaliation. 10 22 27 28
• Horikita Suzune — Class D classmate whose reaction to Student Council President Horikita Manabu leads Shiomiya to begin observing her. He later assists Kushida’s attempt to apologize to Horikita, though Horikita remains wary of both of them. 3 20 30
• Ayanokoji Kiyotaka — Class D classmate whom Shiomiya initially observes as an unusual and difficult-to-read person. Shiomiya later blackmails him with knowledge of the White Room, then works with him during the effort to have Class C withdraw its accusations. 23 35
• Horikita Manabu — Student Council President and Horikita Suzune’s older brother. Shiomiya records Manabu’s treatment of Suzune, confronts and defeats him physically, then extorts points from him with the recording. 29 30
• Aoi Morishita — A mysterious girl who approaches Shiomiya while he is seeking artistic inspiration, praises his work, and calls him the “Tin Man.” 19
• Ichinose Honami — Class B student who purchases Shiomiya’s information regarding academy anomalies for 500,000 points. 22
• Yae Ogami — Professional boxer and Yamada Anna’s friend. She challenges Shiomiya over his treatment of Yamada; after their match, she accepts his apology to Yamada. 49

Story Role / Major Arcs

Arrival at Hope's Peak Academy

Shiomiya travels to Hope's Peak Academy, reunites with Koenji on the bus, and encounters Kushida. His system activates upon entering the school and assigns him a long-term task to observe and record humanoid life forms. 1

God-Human Observation Diary

He begins his observation diary, earns his first points, and acquires Ultimate Lucky and Ultimate Fighter. He starts cataloguing classmates and identifying individuals he finds extraordinary. 2 3

Rooftop Conflict with Kushida

Kushida summons Shiomiya to the rooftop and pressures him to leave school because he knows her past. An episode causes Shiomiya to lose emotional control, but he recovers, refuses to withdraw, records Kushida’s threat, and breaks out through the locked door. 3 4

Sakayanagi and Kamuro Incident

Shiomiya witnesses Kamuro shoplifting and Sakayanagi blackmailing her. He uses recordings to gain leverage over both girls, later establishes contact with them, and turns his attention toward chess and further diary entries. 5 6

Information Gathering and Point Scheme

Using his detective ability and practiced charm, Shiomiya extracts academy-rule information from Yamada Anna. He then seeks to profit from the school’s merit system and purchases a one-time viewing of first-year student records from Sae Chabashira for 50,000 points. 7 8

Morning Training and Class C Brawl

Shiomiya begins training with Koenji, rediscovering an interest in martial arts as self-cultivation. After noticing Ibuki Mio’s injuries, he investigates Class C and joins Koenji in defeating Class C students, including Ryuuen. 9 10

Chess Rivalry and School Dealings

Shiomiya gains further talents, challenges Sakayanagi at chess, defeats her in three rounds, and sells her valuable information concerning hidden rules and point distribution. 11 12 13

Piano Breakdown and Kushida’s Leverage

His emotionally charged piano performance causes a breakdown. While vulnerable, he reveals the existence of his system and diary to Kushida; she attempts to exploit this knowledge and later uses ambiguous evidence from their night together to force his compliance. 14 15 16 17

Self-Discovery and Analyst Evolution

Shiomiya accepts that his enjoyment of observing others is central to who he is, while his failed self-portrait exposes his uncertainty over his own identity. After meeting Aoi Morishita, he records new observations, receives a quest to surpass his talent limits, and draws Ultimate Soldier and Ultimate Analyst. 18 19

Information Sales and Class D Conflict

Faced with extravagant monthly spending, Shiomiya sells academy information to Classes B and C. Rumors about the transactions turn Class D against him, while Class C students later attack him; Shiomiya defeats the attackers and uses Ayanokoji and Horikita in a scheme that has Class C withdraw its accusations. 21 22 27 29 35

School Influence and Point Businesses

Shiomiya gives Kushida access to the academy information he sold, allowing her to build standing within Class D. He expands his own influence through plaza chess challenges, food reviews, and an electronic map of food establishments, while continuing to monitor Kushida’s nighttime trips to the artificial lake. 39

Boxing Match and Three-Talent Draw

Yae Ogami challenges Shiomiya to a boxing match because of his treatment of Yamada Anna. Though physically outmatched, he evades her attacks for much of the match, accepts a serious blow, and apologizes to Yamada through Yae. His subsequent diary entry earns enough points to draw Magician, Fortune Teller, and Swimmer. 49 50

Kushida Date and Growing Intimacy

Shiomiya and Kushida go on an awkward date, beginning with a romantic comedy and dinner. Their outing becomes more genuine after Kushida abandons her public façade, throws Shiomiya during an argument, and accompanies him to buy casual clothing. 53 54

Vacation Investigations and Camp Magic

Shiomiya discovers and investigates Sudo’s group’s hidden-camera scheme, while Horikita’s speech redirects the attention of Class A, Class C, and the Student Council. During the later camp period, Shiomiya demonstrates his magician talent for Kushida, prepares a comfortable campsite, catches fish, and becomes suspicious that Ibuki is spying on him. 60 70

Trivia

• Shiomiya calls the people he finds exceptional “God-Humans.” 2
• He considers Kushida’s natural, mature voice preferable to her public cutesy persona. 4 16
• He is willing to skip class when it conflicts with something he finds more interesting. 7 9
• He has a habit of giving observation files dramatic provisional titles, including “Clone’s Observation Diary” and “Incomprehensible Thief Observation Diary.” 3 6
• Aoi Morishita calls him the “Tin Man” after seeing his artwork. 19
• Shiomiya’s monthly spending can reach approximately 300,000 points, making him intensely afraid of becoming poor despite his family background. 22 30