As Kazuki begins to learn more about his enemy and the source of his power he decides to assist Tokito in the eradication of the Homonculi in his town. As Tokito begins investigating the “haunted factory” of the Homonculi she discovers a very disturbing thing, apparently the Homonculi have been developing a new weapon, a parasite that turns people into man eating monsters.

Muto Kazuki and Tsumura Tokiko are investigating who is behind all the homunculi appearances and hostile acts. Only with two leads: He wears a Papillion Mask and attends Kazuki’s high school. With that in mind, Kazuki and Tokiko do a thorough search of the high school–searching for more leads as to who this mysterious ” Papillion Mask Creator ” is.