@Oneesamaa the father is supposedly the senpai, the deformed looking guy on the first page of this chapter. All the girls in the original group were having flings with him
Since this story seems to have taken place about 6-8(?) years ago, I'm curious as to what happened to all the kids and if they'll show up in the current manga at all
Aside from that one guy, it’s refreshing to see a death game manga where all of the characters are supportive and actively looking out for each other. I hope it stays like that