Monsters (stylized in all caps) is a Japanese one-shot manga written and illustrated by Eiichiro Oda. It was published by Shueisha in the Autumn Special issue of Weekly Shà Ânen Jump in October 1994. An original net animation (ONA) adaptation, titled Monsters: 103 Mercies Dragon Damnation, was produced by E&H Production and premiered on Netflix in January 2024. Oda would feature characters from Monsters in his subsequent manga series One Piece, setting the two in the same universe.
Written and illustrated by Eiichiro Oda, the Monsters one-shot was published by Shueisha in 1994 in the Autumn Special issue of Weekly Shà Ânen Jump (with cover date October 30). The chapter was collected in Oda's short stories volume Wanted!, released on November 4, 1998. The character Ryuma would later appear as a zombie in Oda's One Piece manga series during the Thriller Bark story arc, thus officially linking the events of both works.
Viz Media published the one-shot digitally on January 22, 2024, and published the Wanted! volume (under the title Wanted! Eiichiro Oda Before One Piece) on November 12 of the same year.
In July 2023, it was announced that Monsters would be receiving an anime adaptation. Titled , the original net animation (ONA) premiered worldwide on Netflix on January 21, 2024, and January 23 in Japan. Medialink sub-licensed the ONA in Asia-Pacific for streaming on their Ani-One Asia YouTube channel.
The ONA was directed by Sunghoo Park, who was also in charge of composition, and animated by his studio E&H Production. Takashi Kojima served as character designer, with Fuminao Akai as art director, Ryoji Nagasawa as color designer, Lee Ju-Mi as director of photography, Keisuke Yanagi as editor, and Akiko Fujita as sound director. The music was composed by Hiroaki Tsutsumi and produced by Takeki Kobayashi.