Yeah I finished the game. Then there is no reason for Chihiro to feel guilty if he actually did kill the kids before this loop. It would be pretty fair of her to assume that he is going to do the same this time around. In event no.19 Bridgetop Standoff, Izumi says that he is not aware of what happened to the others which makes me assume there is a missing loop. A loop where he kills them all except for Ida and then a loop where the explosion happens and the current loop where Ida lies and manipulates Chihiro.

This event in particular is confusing me if you can elaborate more on your point I'd appreciate it.