Mitsuru Imai is a classmate of protagonist Takeshi. He endures persistent bullying for refusing to tolerate any disparagement of his grandmother, making him a daily target. Bullies vary across adaptations: identified as Andore and Kandore in the pilot chapter and OVA, named Norio in the manga.

Takeshi intervenes directly, confronting and defeating Mitsuru's tormentors. This decisive action ends Mitsuru's prolonged harassment. Mitsuru's subsequent narrative centers on his liberation from victimhood and the establishment of a steadfastly loyal connection to Takeshi as his protector.

The character exists within a broader narrative framework exploring leadership and resilience, where Takeshi's actions exemplify his aspiration to become a significant leader. Mitsuru's storyline illustrates Takeshi intervening to assist those facing adversity.

No documented narrative development, backstory expansion, or additional media portrayals exist beyond this core bullying incident and its resolution.