TV-Series
Description
Kai Takemura experienced severe, prolonged bullying during junior high school alongside classmate Yamato Kurosawa. Bullies physically restrained him, removed his shirt, and threatened him with cigarette burns, leaving lasting physical and emotional scars. Yamato was the sole person who interacted with him during this period, albeit secretly, fearing becoming a target himself. This ordeal led Kai to temporarily leave school. He dedicated a year to intensive physical training, achieving significant growth in height and strength, reaching 188 cm, initially driven by a desire for revenge against his tormentors.

Transferring to Toumei High School placed him a grade behind former classmates Yamato and Mei Tachibana. Kai first encountered Mei at the bakery where she worked, becoming a regular customer. Conversations with Mei, during which she shared her own bullying experiences, shifted his perspective. Realizing the futility of vengeance, he abandoned his revenge plans. He developed romantic feelings for Mei, valuing her honesty and the positive impact she had on his outlook. Recognizing her commitment to Yamato, he consciously stepped back but remained a protective presence in her life, frequently visiting her workplace and intervening during threats.

Kai's interactions with Yamato were initially strained by jealousy and unresolved history. Yamato perceived Kai as a threat to his relationship with Mei, leading to confrontations. During one argument, Kai punched Yamato to jolt him into recognizing his neglect of Mei's feelings. Despite this conflict, Kai later expressed gratitude to Yamato for the secret support during the bullying years, leading to their reconciliation. Kai maintained a straightforward, action-oriented personality, often speaking his mind without hesitation. He enjoyed visiting the theme park "Land" and dedicated personal time to physical exercise.

Megumi Kitagawa exploited Kai's presence, fabricating rumors about Mei's closeness to him to destabilize her relationship with Yamato. After her scheme failed, Kai confronted Megumi, bluntly pointing out her tendency to wear a social mask to avoid genuine emotional connections. This confrontation contributed to Megumi's self-reflection and eventual personal growth. Later, Kai and Megumi briefly dated, a development occurring after the anime's conclusion.

In the manga, Kai formed a relationship with Rin Aoi, a model who actively pursued him. They went on a date to "Land," where Rin initiated a kiss. However, their differing personalities and unresolved issues led to their eventual breakup, as Rin focused on her international modeling career and Kai continued his supportive role within his social circle.