The True Form Homunculus

S1, E2: Tokiko and Kazuki visit the haunted factory where everything began. There, they find the remains of victims and a homunculus incubator. The homunculi made there lodge themselves onto humans and consume them, creating monsters like the one that attacked Kazuki. But who is doing this, and why? Before they can begin their search, Kazuki and Tokiko are attacked from above by a homunculus with giant eagle wings carrying a man in a school uniform on his back.