World Embryo

A virus infects humans, transforming them into monstrous beings called "Kanshu," whose existence remains unknown to the public. A secret organization named "F.L.A.G." hunts these creatures and the infection's origin, using members with powerful abilities to fight them. Riku Amami, a young man disconnected from others, is drawn into the conflict after receiving a message from a deceased relative. He discovers a mysterious cocoon that alters his life in significant ways.