The official website for the new anime short “Narumi’s Week at Work” (Narumi no Heijitsu), based on Naoya Matsumoto‘s Kaiju No. 8 manga, has begun streaming a trailer confirming the series will run for four episodes. The first episode premieres on September 5, with new episodes dropping every Saturday at 8:00 p.m. JST on the TOHO animation YouTube channel. The final episode will stream on September 26. Crunchyroll will simulcast all episodes as they air.
The staff also unveiled a birthday visual for series protagonist Kafka Hibino alongside the trailer announcement.
Story
Gen Narumi, captain of the Defense Force’s First Division and widely regarded as “Japan’s Strongest Anti-Kaiju Combatant,” is a man whose overwhelming power comes with an equally overwhelming ego. He skips meetings without a second thought, deftly dodges office paperwork, and spends his downtime grinding online games — yet even the strongest man alive occasionally finds himself on the receiving end of an unexpected counterattack. This is the story of the most powerful man’s decidedly un-peaceful week at work.
Staff
The core creative team from the television anime is returning for the short:
- Director: Shigeyuki Miya
- Character Designer / Chief Animation Director: Tetsuya Nishio
- Music: Yūta Bandō
- Animation Studio: Production I.G
- Kaiju Designs: Mahiro Maeda
- Art Director: Shinji Kimura
- Color Key Artist: Izumi Hirose
- Compositing Director of Photography: Eiji Arai
- Sound Director: Fumiyuki Go
- Kaiju Designs & Design Works: Khara
Hayato Aragaki, who served as 3D director on both the second television anime season and the Kaiju No. 8: Hoshina’s Day Off video anime, returns in the same capacity. Yuka Yamajō, previously an editing assistant on the TV anime, steps up as editor for the short.
Kōki Uchiyama reprises his role as Gen Narumi.
Live Event and Other Updates
The television anime’s cast will reunite for the “Defense Force Boot Camp in Tachikawa” event on October 24 at Tachikawa Stage Garden in Tokyo. A new visual for the event has also been revealed.
Crunchyroll and Sony Pictures Entertainment screened the first-season compilation film Kaiju No. 8: Mission Recon in an event-style theatrical release across the United States and Canada in April 2025, available in both subtitled and English-dubbed formats.
The television anime’s second season began airing on TV Tokyo and affiliated channels in July 2025, with Crunchyroll streaming it simultaneously. The season also streamed live worldwide on X (formerly Twitter) as it aired in Japan.
Matsumoto launched the manga on Shueisha’s Shonen Jump+ website in July 2020; it concluded in July 2025. Viz Media publishes the manga in English in both digital and print formats, while Shueisha distributes it digitally via its MANGA Plus service under the title Monster #8.
The franchise’s smartphone and PC game, Kaiju No. 8 the Game, launched for iOS and Android in August 2025 and came to PC via Steam in October 2025.
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