The Case Book of Arne

Lügenberg is a city where supernatural beings and humans coexist. Arne Neuntöte, a young vampire with supernatural powers, runs a private investigation office specializing in occult cases. Despite his youthful appearance, Arne is an experienced detective who takes on requests involving curses, monsters, and unexplained phenomena that ordinary authorities cannot handle. Arne works alongside Lynn Reinweiß, the daughter of a human nobleman with a strong interest in vampires, who becomes his assistant after a chance encounter. Together, they investigate a series of interconnected cases involving ghosts, werewolves, witches, and other supernatural entities, many of which are tied to the hidden history of the city. ==Characters==

; : :An original character for the anime, forming a trio with Arne and Lynn to solve cases. ; : ; : ; : ; : ; : ; : :The loyal, seemingly respectable butler. ; : :A kind maid who is like an older sister to Lynn. ; : :Klaus's clumsy personal maid. ; : :The seemingly pleasant but potentially shady security guard. ; : :The manor's skilled chef. ; : :The cheery gardener with feelings for Diana. ; : ==Other media==

Manga A manga adaptation illustrated by Soraho Ina was serialized in Media Factory's manga magazine Monthly Comic Gene from November 15, 2018, to March 15, 2022. The manga's chapters were collected into four volumes from April 27, 2019, to March 26, 2022. Anime An anime television series adaptation was announced on November 6, 2024. It is produced by Silver Link and directed by Keisuke Inoue, with Inoue and Harumurasaki handling series composition with episode screenplays by , Hitomi Ogawa and Akira Nishikubo, Akiko Satō designing the characters based on Harutarō's original designs and also serving as chief animation director, and Yoshiaki Fujisawa composing the music. The series aired from January 7 to March 25, 2026 on Nippon TV's programming block and other networks. The opening theme song is "Q.E.D.", performed by Sou, while the ending theme song is , performed by Watashi Kobayashi. Crunchyroll is streaming the series. Plus Media Networks Asia licensed the series in Southeast Asia and broadcasts it on Aniplus Asia. Episodes ==Notes==