Monster Eater is a Japanese light novel series written by Renkinō and illustrated by Kawaku. It began serialization online in March 2023 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by Earth Star Entertainment, who published two volumes between August 2023 and January 2024 under their Earth Star Novel imprint. A webtoon adaptation illustrated by Kei Ichimatsu and Tanako Tanao and produced by whomor has been serialized online via Line Corporation's Line Manga website since June 2024 and has been collected in four digital volumes. A manga adaptation with art by TATE has been serialized online via Square Enix's Manga Up! manga website since August 2024 and has been collected in three tankōbon volumes. A "light anime" television series adaptation produced by Imagica Infos and Imageworks Studio aired from April to June 2026.