Ryuen

Biodata

Feature	Details
Name	Ryuen Kakeru (龙园)
Alias(es)	Tyrant of Class C 5
Gender	Male
Affiliation	Class C, Tokyo Metropolitan Advanced Nurturing High School 5 11
Occupation/Role	Class C leader and strategist 5 11
Status	Active; later seeks to cooperate against Tsukishiro Shuhei 46
First Appearance	Mentioned in Chapter 2; appears in person in Chapter 5 2 5

Appearance

Ryuen is a nearly 1.9-meter-tall student with short black hair, sharp features, and predatory eyes. His prominent, beast-like canines reinforce the threatening image he cultivates. 5 7

• Tall, sturdy build. 5
• Short black hair and a sharp-featured face. 5
• Ferocious eyes and a predatory stare. 5
• Often grins to display his canine teeth. 7 35
• Drug use leaves him bloodshot-eyed, visibly muscular, and physically unstable. 11 15 19

Personality

Ryuen rules through intimidation, provocation, and violence. He treats Class D as a target to be broken rather than merely defeated, repeatedly threatening Tang Yu, raiding supplies, exploiting personal secrets, and organizing attacks designed to humiliate his opponents publicly. 5 15 32 41

Despite his aggressive exterior, Ryuen fears losing control and suffering punishment within the school’s rules. Tang Yu exploits this insecurity during the Deserted Island Test, bluffing him into retreating from the Central Hill mission point. 7 His later behavior reveals that much of his escalating violence is shaped by outside manipulation and fear of Tsukishiro Shuhei. 37 46

Abilities & Skills

Coercion and Psychological Warfare

Ryuen gathers compromising information and uses fear to control opponents and subordinates.

• Sends scouts to monitor Class D during the Deserted Island Test. 5
• Uses Class C to ambush the Central Hill mission point with improvised weapons. 7
• Collects damaging secrets on students, including Karuizawa Kei’s middle-school photos. 28 32
• Hires outsiders to surveil and threaten Karuizawa. 33 35
• Orchestrates a hostage trap in the abandoned Gymnasium, forcing Tang Yu to face roughly thirty opponents while threatening to broadcast Karuizawa’s photos. 41
• His schemes falter when confronted with evidence, official consequences, or uncertainty over school-rule violations. 7 35 42

Drug-Enhanced Physical Ability

Ryuen uses an illegal enhancement drug that temporarily increases his strength and speed.

• His drug-enhanced state gives him abnormal physical force, enough to slam Tang Yu into a cave wall and fracture his ribs. 11 12
• The enhancement causes bloodshot eyes, swollen muscles, instability, and increasingly irrational aggression. 11 12 15
• Tang Yu identifies Kiriyama Ikiteru as the source of the drugs and later exposes Ryuen’s recorded admission. 14 15
• The enhancement has a visible backlash: Ryuen becomes exhausted during the Class Competition and is defeated by Tang Yu. 15

Combat and Physical Intimidation

Ryuen is a forceful close-range fighter who favors direct, aggressive attacks.

• He repeatedly initiates physical confrontations against Tang Yu. 11 19
• His drug-enhanced attacks overwhelm Tang Yu in the cave confrontation until Class D and Class B reinforcements arrive. 11 12
• He is defeated by Tang Yu’s Shaolin martial arts in the Class Competition and by Wing Chun during a later street assault. 15 20
• Ayanokoji Kiyotaka decisively defeats Ryuen and his assembled fighters during the Gymnasium incident. 42

Items and Enhancements

• Enhancement drugs — Illegally supplied through Kiriyama Ikiteru; temporarily amplify Ryuen’s strength and speed at the cost of instability. 11 14 15
• Micro-controller — A chip implanted in Ryuen’s arm by Tsukishiro Shuhei, according to Ryuen; it can amplify aggression and inflict intense pain. 46
• Compromising photos — Keeps Karuizawa’s photos as leverage until Tang Yu forces their return and destruction. 32 34 35 36

Relationships

• Tang Yu — Primary rival. Ryuen repeatedly targets him through island ambushes, drug-enhanced attacks, blackmail, and the Gymnasium trap; after Tsukishiro’s control becomes clear, he offers Tang Yu an alliance against their shared enemy. 5 11 15 35 41 46
• Ayanokoji Kiyotaka — Identifies Ayanokoji as the school’s “true monster” after being defeated in the Gymnasium. Ayanokoji later characterizes Ryuen’s cooperation with Tsukishiro as forced. 42 44
• Karuizawa Kei — Target of Ryuen’s blackmail campaign. He uses her past photos, sends thugs after her, and kidnaps her to bait Tang Yu. 28 32 33 41
• Kiriyama Ikiteru — Secretly provides Ryuen with enhancement drugs and intelligence during the Deserted Island Test. 10 14 15
• Tsukishiro Shuhei — Manipulates and coerces Ryuen through mental influence and an implanted controller; Ryuen ultimately seeks help to resist him. 37 38 46
• Class C — Ryuen directs Class C’s scouting, raids, ambushes, and intimidation campaigns against Class D. 5 7 15 32

Story Role / Major Arcs

Deserted Island Test

Ryuen begins an aggressive campaign against Class D by dispatching scouts and personally threatening Tang Yu’s camp. He ambushes Tang Yu’s squad at the Central Hill mission point, but retreats after Tang Yu bluffs that their actions have been recorded and exposed. 5 7

He later meets a hooded outsider and receives an unknown package. During a cave confrontation, Tang Yu discovers that Ryuen has taken enhancement drugs and senses evidence of someone directing him from behind the scenes. 10 11 12

Ryuen ambushes the Southeast Warehouse but is delayed by Tang Yu’s Emotion Manipulation. After Class C raids Class D’s supplies, Ryuen faces Tang Yu in the final Class Competition and is defeated. Tang Yu then exposes Ryuen’s connection to Kiriyama’s illegal drug distribution. 13 15

Summer Training and Escalation

Following a suspension, Ryuen confronts Tang Yu in Akihabara with four Class C students while still using drugs. Tang Yu defeats the entire group and intimidates Ryuen with a false claim of security-camera evidence. 19 20

During the Special Training Class’s Resource Allocation Simulation, Ryuen joins Tang Yu’s Military Faction and attempts to incite a rule-breaking coup. Tang Yu’s Emotion Mirror reflects Ryuen’s own fanaticism back at him, forcing him to withdraw the proposal. 24 25

Psychological Warfare Against Class D

Ryuen launches a broader campaign against Class D, publicly declaring a “hunting season” while concealing a more targeted plan. He exploits Karuizawa’s past, works through hired thugs, and threatens to release her photos online. 32 33

Tang Yu obtains recordings and communications records tying Ryuen to the threats. Faced with evidence that could reach the Student Council, School Board, and police, Ryuen agrees to surrender the originals and backups of the photos. 34 35 36

Gymnasium Trap and Forced Alliance

Ryuen kidnaps Karuizawa and lures Tang Yu into the abandoned Gymnasium, where approximately thirty students await. His intent is not only revenge, but the public humiliation of Tang Yu and the destruction of Class D’s cohesion. 41

Ayanokoji arrives and defeats the attackers, including Ryuen. Horikita Manabu ends the incident and announces disciplinary action for the students involved. 42

Afterward, Ryuen admits that Tsukishiro has manipulated him and reveals the controller implanted in his arm. Rather than remain Tsukishiro’s test subject, he proposes cooperating with Tang Yu against him. 46

Notable Quotes

“The hunting season has begun! Target: Class D!” 32

“The biggest gain today... was discovering the true monster of this school.” 42