Oh nice, didnt see this before
Looks like it's focused on some flashbacks? Or at least flashback for Haru, Sumireko and Isuke.
I can only hope that since we see Isuke here in the present, it means they themselves are telling their past to someone else. So that better fucking be Isuke and Haruki in a hotspring or something and it better have some nice panels of them together, not just another DREAM HUG session.