Gleipnir

Gleipnir is a Japanese manga series written and illustrated by Sun Takeda. It was serialized in Kodansha's seinen manga magazine Young Magazine the 3rd from October 2015 to April 2021, and later transferred to Monthly Young Magazine, where it ran from May 2021 to April 2023. Wikipedia. The story of the anime series Gleipnir revolves around Shuichi Kagaya, a high school student who can transform into a powerful monster, and Claire Aoki, a girl whose sister was also turned into a monster by an unknown organization. They are forced to work together to uncover the secrets behind the organization and the creation of these monsters, while also facing threats from others who seek to control the organization's power.