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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. Time is short because of the Homunculus attached to Tokiko, which threatens to take control and transform her into one of the Homunculi in one week!