Board Thread:General Discussion/@comment-17069967-20150414232126/@comment-180.191.92.6-20150421110059

Actually, in one of the episodes Nagisa asked Haru if he lived alone and Makoto said that Haru lives alone because when Haru's dad had to move because of work his mother went with his dad.

I think he mentioned it on either episode 1 or 2 of the first season.