It could be a red herring, but he was probably one of the victims of Reiko's rampage.
I like how some of the characters have additional chapters that focus on them instead of just being one-offs. Rikka is probably my favorite girl among the ones the two have met so far.
that panel with many hand point at the way really remind me of SZS OP haha and the plot that hitomi still here through the eye that she donate really make me think of kafuka hahaha