Kaiju No. 8 is a Japanese manga series written and illustrated by Naoya Matsumoto which was serialized on Shueisha's Shōnen Jump+ app and website from July 3, 2020, to July 18, 2025, with its chapters collected in 16 volumes, and on Shueisha's Manga Plus website and app since July 22, 2020, under the title Monster #8 in English and several other languages. The 16th and final volume was released on September 4, 2025. The story follows Kafka Hibino who, after ingesting a parasitic creature, gains the ability to turn into a and now must navigate using his power while trying to become part of an organization that eliminates kaiju to fulfill a promise he made with a childhood friend.
Viz Media began publishing the series in English on its website on August 2, 2020, under the title Kaiju No. 8, and on February 19, 2021, it announced that it had licensed the series for print in English, releasing the first volume on December 7, 2021.
Manga Kaiju No. 8
Kaiju No. 8 B-Side is a spin-off that ran from January 5 to July 12, 2024, on Shōnen Jump+ illustrated by Kentaro Hidano. The spin-off is based on the light novel Kaiju No. 8: Exclusive on the Third Division, written by Keiji Andō, and features side-stories of Defense Force members. Shueisha collected its chapters in two volumes that were released on April 4 and October 4, 2024.
Shueisha and Viz Media began publishing the series in English on January 4, 2024, Shueisha on its Manga Plus website and app and Viz Media on its Shonen Jump website and app. Viz Media released the volumes in print on April 8 and September 2, 2025.
Kaiju No. 8 Relax Kaiju No. 8 Relax is the second spin-off manga illustrated by that began its serialization in Saikyō Jump on June 4, 2024, and on Shōnen Jump+ on June 7 of the same year. Viz Media began publishing the series in print, with the first volume releasing on December 2, 2025.
Novels Kaiju No. 8: Exclusive on the Third Division A 4-chapter side-story light novel titled written by Keiji Andō and illustrated by Matsumoto, was released on November 4, 2022. On February 2, 2024, Viz Media announced that it had licensed the light novel for print in English. It was published on December 3, 2024.
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