Each episode was streamed three days in advance of the TV broadcast from April 2, 2024 on U-NEXT, Anime Houdai, and Crunchyroll. Regular broadcasting began April 5, 2024.
A sequel light novel series to the original light novel this anime is based on, written by Kanekiru and illustrated by Naji Yanagida, titled Re:Monster: Ankoku Tairiku-hen, began publication by AlphaPolis in July 2018.
Based on a Japanese light novel series written by Kogitsune Kanekiru and illustrated by Yamaada. It was serialized online between May 2011 and 2018 on the user-generated novel publishing website Shosetsuka ni Narou. It was later acquired by AlphaPolis, who have published nine main volumes, a side story volume and an extra volume between August 2012 and August 2017.
All Webbed Up: Rou can create spider thread from his fingers after eating a demon spider, and frequently uses the ability to bind opponents.
Absurdly Sharp Blade: The Nenekaruri knife that Aoi uses to kill Kanata, it cuts through molecules, and also doubles as a stun blade.