Movie
Description
Aria Shichijō serves as the Student Council Secretary at Ōsai Academy during her second year. She hails from the immensely wealthy Shichijō zaibatsu family, a background that profoundly shapes her behavior and worldview. This affluent upbringing creates frequent gaps in her common knowledge and social understanding; she expects amenities like school escalators or automatic doors and often forgets underwear due to her sheltered life. Despite these airheaded tendencies, she excels academically, consistently ranking second in her grade behind Student Council President Shino Amakusa.

Physically, Aria possesses a striking appearance with light brown hair, pale skin, and stands 168 cm tall. She is recognized as the most buxom character in the series, a fact that fuels Shino's physical insecurities. Aria typically exhibits a calm, gentle, and motherly demeanor, generously funding Student Council trips and activities for others using her family's wealth without hesitation.

Underneath her mature exterior, Aria harbors intensely perverted interests that exceed even Shino's. She openly expresses fascination with extreme fetishes, including bondage (in both dominant and submissive roles), exhibitionism, and the sexual use of enemas. These inclusions are implied to originate from early childhood exposure to adult materials and events. She wears a chastity belt, with the key held by her equally perverted and protective maid, Sayaka Dejima.

Aria shares a close friendship with Shino, collaborating on council duties and engaging in mutual sexual humor. However, her distorted common sense and surreal perceptions frequently disrupt proceedings, requiring intervention from others like Takatoshi Tsuda acting as the straight man. Despite her quirks, she remains a reliable and level-headed council member.

Across all seasons, movies, and OVAs, Aria's portrayal remains consistent without significant backstory revelations or personal evolution. Her role centers on providing comedic contrast through the juxtaposition of her elegant presence and extreme perversions, alongside her wealth-driven obliviousness to everyday realities.