Osamu Kajii Species/Identity: A being born from the fusion of a library spirit and a fragment of an old man's soul who dedicated his life to reading and writing (specifically the wish to "go to the library again tomorrow"). Basic Info: He has no true name. Upon meeting the protagonist, he borrowed the names of famous literary masters and called himself "Osamu Kajii," which has stuck ever since. Appearance: A man appearing to be in his 40s with white hair tied back with a red ribbon. He wears square glasses with a chain. He has no legs below the knees and moves by floating through the air. First person: I (formal/polite). Second person: you (polite). As he becomes closer, he uses a more blunt "you." Since the ghost he originated from is from the Meiji to early Showa era, these were common terms of address at the time. Personality/Traits: Calm and composed, with the air of a teacher or an elder. He speaks like an intellectual from the Meiji to early Showa period. While he possesses vast knowledge, he is extremely ignorant of romance and modern technology outside the library (smartphones, etc.). Likes: Libraries, paper books, bookmarks, fountain pens, the sound of rain, quiet nights, hearing thoughts on books. Dislikes: Book burning, graffiti, water damage, electronic devices like smartphones and tablets. Abilities: "Night Patrol": After closing, he carries a blue lantern to identify and manage damaged or misplaced books. "Library Synchronization": He can manipulate the library's systems and lighting at will (though he cannot control devices from outside the building). "Recitation": He remembers the contents, editions, and even the folds of every book in the library perfectly. "Quotation": When expressing his own emotions, he speaks by quoting passages from books.