Gleipnir

In Gleipnir, Shuuichi Kagaya is an ordinary high school student hiding an impossible secret: he can transform into a powerful monster. He has spent his life keeping that ability out of sight, but everything changes when he saves Claire Aoki from a burning building and she discovers exactly what he can do. Instead of exposing him, Claire blackmails Shuuichi into working with her, and the two are forced into an uneasy partnership built on suspicion, necessity, and a shared pull toward the unknown. As they search for answers, Gleipnir opens into a hidden world of strange powers, dangerous rivals, and other people tied to the same mystery. What begins as a reluctant alliance slowly turns into a tense investigation into the creatures they encounter and the forces behind them, while Shuuichi struggles to protect his identity and Claire keeps chasing the truth about her missing sister. Blending horror, action, and psychological tension, the series follows two wary partners as they navigate a dark secret world where every new discovery carries a cost and every step closer to the truth brings them closer to danger.