Shimon Takagi is a senior student at Seiryu High School, an all-boys boarding institution, preparing for graduation as one of five central figures. He possesses distinctive blond hair, a notable shift from earlier conceptions depicting him with brown hair, and carries a model-like presence within the group.

His school experience takes an unexpected turn when drama club president Mizuho Kusanagi manipulates him and his friends into performing in a "Little Women" adaptation, requiring them to wear women's clothing despite initial resistance. This forced participation ultimately contributes to his personal development alongside his peers.

Beyond the primary narrative, alternate media interpretations present varied scenarios: one involves a counterpart navigating singledom who attracts a transvestite's attention; another frames him within familial contexts, rehearsing comedic marriage proposals in false mustaches. These variations explore different relationship dynamics while reflecting recurring themes of social interaction and adaptability linked to his persona.

His journey consistently intersects with themes of reluctant participation leading to self-discovery, often through performative or socially unconventional situations. Within the broader franchise, he is part of the "M" group identity, symbolizing shared experiences and musical expressions tied to their graduation. Solo musical pieces, like the ending theme "Hohoemi ni Kiss o," are associated with his character in related media.