Natsume Yu

Biodata

Feature	Information
Name	Natsume Yu (夏目悠)
Alias(es)	“Invisible Person” / “Invisible Man”; “Master”
Gender	Male
Affiliation	Class D
Occupation/Role	Student; behind-the-scenes strategist
Status	Active 50
First Appearance	Chapter 1

Background and History

Natsume deliberately achieved average entrance-exam scores to enter Class D, intending to remain unnoticed while observing the school’s social structure from within. While his classmates celebrate their initial private-point allowance, he identifies it as a trap and begins assessing their spending habits, influence, and exploitable weaknesses. He immediately takes notice of Ayanokoji Kiyotaka, recognizing his deliberately ordinary demeanor as camouflage rather than genuine mediocrity. 1

During Class D’s point crisis, Natsume quietly pushes the class toward action. He posts anonymous questions about the school’s point system, leaves a contract-law book for Ayanokoji to find, and gathers evidence of Kushida Kikyo’s middle-school conduct. He records these plans in a personal strategy notebook, assigning Ayanokoji the role of a “masterpiece,” Horikita Suzune that of a usable blade, and Kushida as a future tool rather than a trusted ally. 3 5 6

His early blueprint is to establish Horikita as Class D’s visible leader, use Ayanokoji as the class’s decisive weapon, and force Kushida into serving as his intelligence source. He expands this ambition beyond Class D, intending to influence the entire first-year grade and eventually lead Class D toward Class A. 8 9 10

Appearance

Natsume cultivates the image of an unremarkable, gentle student who spends his time reading, sleeping in class, or staring out the window. Sakura describes his face as clean and delicate, with a gentleness that contrasts sharply with his controlling conduct. 20 34 49

• Usually wears a harmless, reassuring smile when interacting with others. 5 39
• Commonly sits by the window with a book, maintaining an indifferent, low-profile presence. 38 49
• Is regarded by classmates as nearly invisible until his influence becomes harder to ignore. 19 47

Personality

Natsume is calculating, patient, and intensely control-oriented. He views classmates as pieces on a chessboard, preferring to shape their choices indirectly rather than openly command them. His plans account for emotions, personal weaknesses, and the social consequences of success or failure. 6 10 28

He maintains a calm, courteous exterior even while threatening or manipulating others. This contrast is central to his methods: Kushida finds his gentle demeanor more unsettling than Ayanokoji’s blunt detachment, while Horikita considers his ordinary-student persona a dangerous disguise. 16 39

Natsume takes clear satisfaction in being needed and obeyed. His protection of Sakura develops into a possessive master-servant dynamic, while his control of Kushida is built on blackmail, fear, and carefully rationed approval. 10 24 34 38

Abilities & Skills

Strategic Planning and Psychological Manipulation

Natsume specializes in long-term schemes that use each participant’s temperament and incentives against them.

• Assesses Class D’s social hierarchy, spending patterns, and vulnerabilities shortly after enrollment. 1 2
• Uses anonymous forum posts and indirect prompts to provoke Class D into discussing the point system and acting collectively. 5 6
• Designs roles for Horikita as a public leader and Ayanokoji as a concealed decisive force. 8 9
• Manipulates Ryuen into targeting Hashimoto Masayoshi, creating tension between Classes A and C. 29
• Directs Class D’s Sports Festival strategy through detailed analysis of runners’ stamina, habits, and psychological state. 45 46

Intelligence Gathering and Network Building

Natsume turns social relationships into sources of surveillance and leverage.

• Investigates Kushida’s past through online records and preserves material capable of exposing her façade. 5 6
• Compels Kushida to gather classmates’ secrets, weaknesses, relationships, and information on the leaders of the other classes. 20 23 28
• Uses Sakura as an observer who reports classmates’ behavior, especially Kushida’s actions and Class C’s movements. 38 39
• Orders Ayanokoji to monitor Ryuen’s contacts, movements, and activities without being discovered. 49
• Uses Kushida’s reports to learn of Sakayanagi Arisu’s investigation and of Ichinose Honami’s past. 48 49

Social Camouflage

Natsume conceals his role by performing as a harmless, lazy, ordinary student.

• Deflects public recognition for Class D’s Sports Festival success toward Horikita, Ayanokoji, and the class as a whole. 48
• Allows Ayanokoji to become the public face of Class D’s strength, drawing attention away from himself. 46 48
• Gives Horikita a deliberately mundane explanation for his actions while offering an alliance built on his methods and intelligence. 39
• Misleads Sakayanagi’s investigation by using Ayanokoji as a false focal point. 50

Academic and Technical Competence

Natsume demonstrates practical competence outside his strategic work.

• Solves Sakura’s math problem with a written explanation. 10
• Repairs the focus ring on Sakura’s DSLR camera after identifying a safety lock. 9
• Reads philosophical works and impresses Shiina Hiyori through his interpretation of existentialist ideas. 49

Equipment / Items

• Strategy notebook — Records Class D’s relationship chart, his assessments of Ayanokoji, Horikita, and Kushida, and his planned manipulations. 6 7
• Mobile phone — Used to record evidence, communicate instructions, store reports, and maintain leverage over Kushida. 12 19 39
• USB drives — Used to plant selected evidence about Kushida for Ayanokoji and later to provide Kushida with information on Horikita. 9 30
• Kushida’s intelligence files — A categorized database of student information across all first-year classes. 29

Relationships

• Ayanokoji Kiyotaka — Tactical partner and primary “blade.” Natsume recognizes Ayanokoji’s concealed ability early, repeatedly gives him tasks, and uses his public achievements as cover; Ayanokoji later begins questioning the unequal nature of their alliance. 1 9 28 49
• Horikita Suzune — A prospective ally and public-facing leader. Natsume provides methods and intelligence while expecting her to handle leadership and execution; she remains wary of his motives. 8 39 43
• Kushida Kikyo — Blackmailed informant known to Natsume as the “Blade of Intelligence.” He weaponizes her social network, orders her to collect secrets, and rewards compliance while maintaining control through fear. 20 23 24 28 44
• Sakura Airi — Protected classmate turned devoted servant and spy. Natsume earns her trust through repeated acts of reassurance and protection, then assigns her observation duties and treats her as his possession. 2 34 38 40
• Ichinose Honami — Class B’s leader and a major target of Natsume’s larger plans. She recognizes that he may be central to Class D’s success, seeks friendship, and later becomes the focus of his intervention against Class C. 19 48 50
• Ryuen Kakeru — Rival from Class C whom Natsume repeatedly maneuvers into unfavorable positions. Natsume’s plans exploit Ryuen’s aggression and culminate in the “Dragon Hunting Plan.” 13 40 46 49
• Shiina Hiyori — Class C student whose trust Natsume gains through their shared interest in literature; she provides him with information about Ryuen’s increasingly unstable class. 49
• Sakayanagi Arisu — Class A leader investigating Natsume’s background and routines. Natsume responds by steering her attention toward Ayanokoji. 49 50

Story Role / Major Arcs

Class D Point Crisis

Natsume enters Class D under an average-student façade, studies the class’s weaknesses, and subtly encourages the point-system crisis to push Horikita and Ayanokoji into action. At the same time, he begins collecting the evidence needed to control Kushida. 1 3 5 9

Uninhabited Island Special Exam

Natsume treats the survival exam as a hunting ground, records students’ behavior, and works with Ayanokoji and Horikita while laying a trap for Ryuen. Class D gains 15 points from Class C’s rule violation and ultimately finishes first with 225 points; Natsume remains publicly inconspicuous while others receive the credit. 11 13 18 19 20

Creation of the “Blade of Intelligence”

Using evidence of Kushida’s past and her fear of exposure, Natsume forces her into becoming his informant. Her social persona becomes an intelligence network capable of extracting secrets from students across the grade, and Natsume continually expands her assignments. 20 23 24 28 29

Sports Festival and the Dragon Hunting Plan

Natsume uses Kushida’s surveillance, Sakura’s loyalty, Horikita’s visible authority, and Ayanokoji’s performance to prepare against Ryuen. His analysis allows Ayanokoji to coordinate Class D’s relay strategy and defeat Ryuen without showing his full ability; Class D finishes fourth in the Sports Festival. 39 40 45 46 47

Post-Festival Expansion

After the Sports Festival, Natsume forms a working connection with Class B, gains Shiina’s trust, monitors Ryuen through Ayanokoji, and begins a plan to undermine Ichinose before positioning himself to “save” her class. Meanwhile, he redirects Sakayanagi’s investigation toward Ayanokoji. 48 49 50

Notable Quotes

“The board is set. All that remains is to place the pieces. And it is time to reel in that Two-faced Cat.” 6

“I want you to be my eyes and ears, infiltrating every corner.” 28

“I only become strong when you are being bullied.” 48