Yuuji Kagura, a central character, was once a sweet and innocent child remembered by his childhood friend Kazuki Arisaka for his playful nature. After moving away for a decade and returning, he appears to have transformed into an openly lecherous and obnoxiously perverted individual, frequently engaging in inappropriate behavior, having lewd fantasies, touching girls inappropriately, and often finding Kazuki half-dressed.

Beneath his outward actions, a kind and caring side remains. He deeply values his friendship with Kazuki, demonstrated through supportive actions like helping her pick out a swimsuit based on her favorite color. His perverted actions are primarily directed toward Kazuki, suggesting an underlying romantic interest.

A significant reveal shows that his perceived transformation is misleading. He was always a playful and somewhat lecherous child, but Kazuki had over-idealized her memories, forgetting his earlier behavior. His childish playfulness, combined with puberty, made his actions appear more obnoxious upon his return.

His younger sister, Marie Kagura, is tasked with punishing his indecent behavior using airsoft or paintball guns hidden within her teddy bear and other puppets. Despite this, he cares for his sister and exhibits a protective nature. The siblings experience a sense of parental abandonment due to their father's frequent relocations for his work as a press photographer and treasure hunter, which made forming lasting friendships difficult.

As the story progresses, he shows development by aspiring to become a professional photographer and working as an intern in the field, demonstrating dedication and skill. His relationship with Kazuki evolves from constant conflict to a deeper understanding; he experiences significant shock and despair at the thought of breaking up with her and eventually expresses that he finds her cute, indicating maturation beyond his initial juvenile behavior.

His interactions further define his traits. He exhibits jealousy when believing Kazuki has a crush on someone else. While a self-proclaimed pervert, he also demonstrates a chivalrous code, refusing to direct his advances toward the young Nina Isokawa despite her crush on him. He forms a friendly, possibly hetero-life-partner relationship with his class president, Kōsuke Machida.

Throughout the series, he balances his lecherous tendencies with genuine kindness and loyalty, particularly toward Kazuki. His journey involves reconciling his playful childhood nature with the expectations of adulthood and navigating his complex romantic feelings amidst his inappropriate behavior.