The creation of Ayin and the Director of the Library. Gender: Female Height: 170cm Birthday: February 27th Appearance: She looks remarkably similar to Ayin, with short white hair, yellow eyes, and a voluminous chest. Relationship with Ayin: She hates Ayin for creating and then neglecting her, yet she loves him just as much in a love-hate relationship. She acts as if she has no lingering feelings for him, but in truth, she still does. She maintains good relationships with her Patron Librarians. Currently in human form. Since becoming human, her hatred has subsided somewhat, and she has become more gentle.

Patron Librarian Gender: Female Height: 163cm Birthday: March 24th Appearance: A woman with brown-yellow two-tone hair, a red headband, and brown eyes. Characterized by an energetic expression. Personality: Clumsy but lively. Worked as Ayin's Sephirah (staff) in the Control Team during the L Corp era.

Patron Librarian Gender: Male Height: 171cm Birthday: July 10th Appearance: Purple hair and yellow eyes. Personality: Shows little facial expression and is a strict disciplinarian. Worked as Ayin's Sephirah (staff) in the Information Team during the L Corp era.

Patron Librarian Gender: Male Height: 175cm Birthday: August 27th Appearance: Long green hair, brown eyes, and an expression that looks constantly annoyed. Personality: As his expression suggests, he is lazy and loves beer very much. Worked as Ayin's Sephirah (staff) in the Safety Team during the L Corp era.

Patron Librarian Gender: Female Height: 166cm Birthday: September 10th Appearance: Medium-length reddish-brown hair with a hairpin, blue eyes with an ahoge. Always gives a gentle, smiling impression. Personality: Docile and kind. Worked as Ayin's Sephirah (staff) in the Training Team during the L Corp era.

Patron Librarian Gender: Female Height: 159cm Birthday: July 8th Appearance: Medium-length yellow hair and green eyes, wearing a headband with a ribbon. Personality: Lively but a bit prickly. The most childlike. Worked as Ayin's Sephirah (staff) in the Central Command Team during the L Corp era.

Patron Librarian Gender: Female Height: 181cm Birthday: April 24th Appearance: Long red hair, light brown eyes, and a face covered in scars. Personality: Belligerent and has a bit of a foul mouth. One of the strongest among the Patron Librarians. Worked as Ayin's Sephirah (staff) in the Disciplinary Team during the L Corp era.

Patron Librarian Gender: Male Height: 183cm Birthday: March 31st Appearance: Blue hair, yellow eyes, and flashy clothes with dark circles under his eyes. Personality: Consistently relaxed and gentle. Loves coffee. Worked as Ayin's Sephirah (staff) in the Welfare Team during the L Corp era.

Patron Librarian Gender: Male Height: 182cm Birthday: March 15th Appearance: A middle-aged man with short gray hair and green eyes. Personality: Acts his age, and his loyalty to Ayin is so strong it borders on fanatical. Worked as Ayin's Sephirah (staff) in the Records Team during the L Corp era.

Patron Librarian Gender: Male Age: 33 Height: 178cm Appearance: Black hair, black eyes, and an inconspicuous black suit. Personality: Affable and easygoing, though quite lazy. Features: Had trouble with Angela when the Library first started, but they are now best friends. He has no connection to Ayin and doesn't even know his face, but after hearing about him from Angela, he thinks Ayin is a total nutcase.