Sundome, Vol. ‪6‬

It's summer break, and Hideo is determined to spend as much of it with
Kirino as possible. The O.B. have determined that the Roman Club must
complete a number of overnight challenges at spooky spots throughout
the area. It seems like a perfect opportunity for Hideo to get cozy with
Kurumi, but her continued association with the mysterious older man
plagues his mind.