Gleipnir (Japanese: グレイプニル,
Hepburn: Gureipuniru) is a Japanese manga series written and illustrated by Sun
Takeda. It has been serialized in Kodansha's seinen manga magazine Young
Magazine the 3rd since October 2015, and collected into ten tankōbon volumes as
of May 2021. The manga has been licensed in North America by Kodansha Comics.
An anime television series adaptation by Pine Jam aired from April to June
The story centers on Shuichi Kagaya, a high school student with an unusual secret. He has the ability to transform into a monster resembling a giant dog mascot costume with a zipper down his back and a large cartoonish smile. After rescuing a strange girl, Claire Aoki, from a warehouse fire, they join each other to search for Claire's older sister, who is assumed to be responsible for the death of their parents.