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Kaiju No. 8 (Japanese: 怪獣8号, Hepburn: Kaijū 8-gou), also known in English as Monster #8, is a Japanese manga series written and illustrated by Naoya Matsumoto. It has been serialized for free on Shueisha’s Shōnen Jump+ application and website since July 2020, with its chapters collected in six tankōbon volumes as of March 2022. Viz Media has licensed the series for English release in North America.