Supernatural Sleuths Assemble: 'The Case Book of Arne' Anime Reveals Major Voice Cast Ahead of 2026 Premiere

Anticipation for the forthcoming television anime adaptation of Arne no Jikenbo (The Case Book of Arne) reached a new peak following the recent unveiling of its expanded voice cast. The supernatural mystery series is slated for a highly anticipated debut during the Winter 2026 season, with its premiere scheduled for January 7, 2026, precisely at 1:29 a.m. JST. This major announcement, delivered on November 6, 2025, solidifies the rich vocal ensemble poised to bring the beloved characters from the original game to vivid life.

Expanded Voice Cast Confirmed

The newly confirmed additions feature a roster of acclaimed talent stepping into pivotal roles. Mariya Ise, known for her powerful performances, joins the team as Louis Hartmann. The titular vampire detective, Arne Neuntöte, will be voiced by Koki Uchiyama, with Aimi Tanaka handling the voice work for the character’s younger iteration.

Rounding out the essential cast are Yuka Nukui as Lynn Reinweiß, the nobleman's daughter captivated by vampire lore; Yuki Sakakihara as Zisye; Yuuki Shin as Nachzehrer; and Yōko Hikasa as Amy. These performers complement the previously announced production staff, which includes the original creators instrumental in the property’s initial success.

Commitment to Source Material Integrity

Produced by Studio Silver Link, the anime adaptation benefits directly from the involvement of the original creative minds. Murasaki, who penned the original scenario, is handling the series composition, ensuring narrative fidelity. Likewise, Harutarou, the original character designer, is contributing their distinctive aesthetic to the animated visuals. This dedication to preserving the source material’s integrity is a major reassurance for long-time fans.

Origins of The Case Book of Arne

The Case Book of Arne began its journey as a highly successful freeware RPG Maker title, developed by Harumurasaki and launched via Vaka Game Magazine in November 2017. Its immediate popularity spurred further development, including a serialization as a manga by Soraho Ina in Media Factory's Monthly Comic Gene between 2018 and 2022, alongside an international release on Steam.

The compelling narrative centers on Arne Neuntöte, a discerning vampire detective who utilizes his supernatural abilities to unravel complex mysteries, often alongside Lynn Reinweiß, who holds a deep fascination for the occult. By translating the atmospheric suspense and unique blend of fantasy and investigation to the small screen, the anime is set to captivate a broad global audience. As the Winter 2026 schedule approaches, fans are still eagerly anticipating the full disclosure of the anime’s theme song titles and performing artists, promising further excitement in the coming weeks.