Don-chan is a male student enduring persistent bullying from his classmate Yaragase. He faces this mistreatment with quiet endurance, as classmates ignore his pleas for help, fearing they might become targets. He also avoids telling teachers, suffering silently.

His only solace comes from an old food stall owner and a one-eyed stray cat he feeds. These connections offer temporary sanctuary from the bullying. The narrative examines his victimization primarily through the eyes of a witness ("Boku"), who observes the abuse repeatedly and wrestles with guilt over his own inaction.

A turning point arrives when the guilt-ridden witness indirectly intervenes, exposing Yaragase's trousers during an attack. This prompts Don-chan to retaliate by pulling down Yaragase's trousers, resulting in public humiliation. After this incident, Don-chan transfers to another school. His story concludes with a letter to the witness, confirming his improved situation and offering forgiveness, highlighting the lasting impact of bystander inaction. The stray cat he cares for, which loses an eye, mirrors his own vulnerability and need for protection.

His character arc underscores themes of isolation and resilience amid relentless victimization, framed through the witness's evolving perspective.