Kimio Suga, a high school student, finds himself entangled in an unconventional relationship following an accidental incident in the girls' locker room. While hiding inside a locker to avoid detection, he is discovered by classmate Komine Nozomi, who protects him from exposure. This encounter leads to a blackmail arrangement where Kimio must participate in mutual voyeuristic exchanges initiated by Nozomi through their apartment windows, as they live across from each other in the same building complex. Initially passive and compliant, Kimio adheres to Nozomi's demands to protect his school reputation. His behavior often involves accidental perverted situations, like unintentionally witnessing intimate moments or experiencing physical collisions with female classmates. He typically reacts with embarrassment and discomfort rather than deliberate exploitation. Over time, his relationship with Nozomi evolves beyond coercion, showing genuine concern for her wellbeing during conflicts with peers like Michiru Sonoda, an academically competitive classmate whose schemes against Nozomi cause Kimio to reassess his initial admiration for Michiru. Kimio unintentionally attracts romantic attention from classmates including the athletic Mirei Watanuki and the academically inclined Mahiru Shīna. His interactions with Mahiru involve collaborative efforts to resolve interpersonal conflicts, such as mediating a dispute between friends affected by body image insecurities. He also participates in a "boyfriend bluff" scenario with Mahiru to deter an obsessive admirer, Haruka Mukai, though the attempt proves unsuccessful. Kimio has black hair, green eyes, and wears standard high school attire. Academically, he maintains average performance without notable achievements or deficiencies. In later developments, Kimio demonstrates increased assertiveness in navigating social challenges, particularly confronting manipulative situations involving Nozomi. His protective instincts emerge during scenarios with external threats, reflecting a shift from reactive to proactive behavior. The conclusion of his narrative arc revisits the locker room setting where his relationship with Nozomi began, symbolizing cyclical resolution.