The animation was released in late 2020 in Japan. It features voice work by actors such as and Yuuri Akeshima . According to IMDb , the series has maintained a niche following within the adult animation community, often cited for its specific focus on the library setting and the dramatic shift in its lead character's personality. Toshoshitsu no Kanojo: Seiso na Kimi ga Ochiru made - IMDb

The antagonist who serves as the janitor. He is depicted as a manipulative figure who lacks a moral compass and takes full advantage of Serizawa's inability to say no.

The narrative follows the psychological and physical "falling" of Serizawa as she is subjected to Kitou's various whims, moving from a position of purity to one of total submission. Key Characters

The story centers on , a kind-hearted and "seiso" (pure/clean-cut) student who frequently visits the school library. Her downfall begins when she encounters Kitou , a school caretaker or janitor with a poor reputation who is often scolded by other faculty members.

In an act of genuine kindness, Serizawa defends Kitou after witnessing a teacher admonishing him.

A teacher who initially scolds Kitou, setting the stage for Serizawa’s intervention and subsequent entrapment. Themes and Production

The title translates literally to "The Library Girlfriend: Until the Pure You Falls," highlighting the central theme of . The series is categorized under adult genres including BDSM and bondage, focusing on the transition from "clean" to "fallen".

The protagonist characterized by her "seiso" archetype—represented as an innocent, polite, and academically minded girl who serves as the "library girlfriend".