Yes, I Have Twin Tails

Ayumu goes bowling with his classmate, Orito, where they happen to run into Haruna, Eucliwood and Seraphim who have been spending the day playing games together. Ayumu tries to keep Orito from finding out the girls are living with him, but fails miserably. Afterwards, Orito takes Ayumu with him to visit a girl named Kyōko who was injured in the serial killer incidents. Once alone with her, Ayumu asks Kyōko about her attacker, whose description supposedly matches that of Eucliwood.