Gleipnir

A teen’s monstrous alter‑ego becomes the reluctant key to a sister’s disappearance and a city’s dark secret.

Shuuichi Kagaya lives a nondescript high‑school life until his body inexplicably mutates into a hulking, indestructible monster. He keeps the transformation a secret, fearing the stigma and the unknown source of his power. One night a burning building traps a girl, Claire Aoki, and Shuuichi’s monstrous form saves her—only to lose his phone in the chaos. The next day Claire tracks him down, convinced his abilities are linked to the bizarre phenomena plaguing the city. She forces him to reveal his true nature by pushing him off the school roof, then snaps a compromising photo to blackmail him into cooperation. Claire’s own agenda is far from innocent: her sister vanished after turning into a monster, and she’s desperate to uncover the truth behind these transformations. Reluctantly, Shuuichi becomes her reluctant partner, and together they plunge into a shadowy world of other shapeshifters, secret organizations, and cryptic experiments. As they chase clues, the line between hunter and prey blurs, and Shuuichi must confront the possibility that his own existence is the key to a larger, more terrifying conspiracy.