Gleipnir

Shuuichi Kagaya seems like an ordinary high school student, but he hides a strange secret-sometimes, he turns into a monster. He doesn’t understand how or why it happens, and he’d rather keep it hidden. One night, he spots a burning building with a girl trapped inside. Choosing to save her, he transforms and carries her to safety, but in the chaos, he leaves his phone behind. The next day, the girl he rescued, Claire Aoki, tracks him down and accuses him of being the monster. When Shuuichi denies it, she pushes him off the school roof to force the truth out. To survive, he transforms again, and Claire takes a photo as blackmail, demanding he explain everything he knows about monsters. The problem is, he barely knows anything. Claire has her own reasons for being interested-her sister also became a monster, and she’s been searching for her. She drags Shuuichi into the hunt, but they soon realize they aren’t the only ones looking for answers.