The world after reincarnation is governed by the laws of Yankee manga.

The provided chapters detail the protagonist's reincarnation into a parallel modern Japan, which subtly differs from his original world. He initially lives a mundane life, but his suspicions about the world's nature are ignited by witnessing an unusually resilient fight between two delinquents, where one is sent flying an improbable distance. This anomaly, coupled with observing a large, armed group of delinquents openly gathering at a train station and engaging in a violent clash, leads him to research and confirm his theory: his world operates under the "rules" of a delinquent manga. He spends five years avoiding trouble by leveraging this knowledge.

However, in his second year of middle school, the protagonist, who is introverted and lacks social skills, becomes a victim of bullying. After enduring it passively, a particularly humiliating incident involving being doused with foul-smelling water pushes him to snap. He violently attacks his tormentor, sending him through a window, and then incapacitates his teacher by slamming him into a blackboard and a desk. Despite the extreme violence, both victims remain conscious and the classroom remains largely undamaged, suggesting the world's "rules" also grant durability to those involved in these manga-like conflicts. The protagonist, now realizing he has fully entered the "mysterious, strong, and emotionally detached" character archetype within the delinquent manga framework, regrets his actions but feels trapped by the world's logic.

The narrative then shifts to the protagonist's family life. He lives with his adoptive mother and stepsister, who are incredibly kind and loving, despite his own emotionally distant nature. His adoptive mother recounts how she took him in after his biological mother, a former prostitute who abused him, committed suicide. The protagonist's past is marked by neglect and abuse, leading to his current detached personality. His adoptive mother and stepsister are aware he is being bullied but are unable to help effectively due to his constant denial and the school's dismissiveness.

The protagonist's life takes a significant turn when he is confronted by a group of high school students, led by a powerful delinquent named Takanami, who is a "Four Heavenly Kings" member from a rival school. Takanami, intrigued by rumors of the protagonist's strength, challenges him to a fight. The protagonist, recognizing Takanami as a "light" type of delinquent who could potentially lead him to a "good end" by helping him escape the delinquent cycle, agrees to a duel.

The duel between the protagonist and Takanami is intense, showcasing the protagonist's superior combat abilities and the world's supernatural durability. Takanami, despite his strength, is ultimately defeated but shows immense respect for the protagonist's fighting spirit. This encounter marks the beginning of a rivalry that the protagonist hopes will lead to his eventual redemption.

Later, Takanami and his friends, Tetsuya and Tomo, visit the protagonist's home. During their stay, the protagonist reveals his tragic past and his complicated family situation, which deeply affects his friends. They also learn about the "Four Heavenly Kings" of their city, a group of powerful delinquents, and the threat posed by a dangerous figure known as "Kuroinu" (Black Dog).

The protagonist is then targeted by Kuroinu's subordinates, who attack him and his stepsister. He shields his stepsister, sustaining an injury, and realizes this is a deliberate trap. He decides to confront Kuroinu, enlisting Takanami's help. They plan to lure Kuroinu and his forces into a trap at an abandoned factory.

The confrontation at the factory escalates when sixty elite subordinates of Kuroinu arrive. The protagonist and Takanami, despite being heavily outnumbered, effortlessly defeat them, showcasing their overwhelming power. The protagonist then brutally interrogates and incapacitates the subordinates, using their fear to his advantage. He contacts Kuroinu, revealing his knowledge of Kuroinu's past as a bullied child and his manipulative tactics, setting the stage for a future confrontation.

The narrative concludes with the protagonist, now recognized as "Shirayuki-hime" (White Ghost Princess) by his enemies, and Takanami preparing to face Kuroinu, with the protagonist aiming to dismantle Kuroinu's power and escape the delinquent manga world.