I'm guessing the end of the story will be similar to "1 litre of tears". Dying slowly whilst experiencing a full love by the one. Ugh! My heart better be ready.
If only Reo were a nicer guy, they would have had a casual threesome. Everyone is happy. The two MCs got a dominant top to dick them without any struggle.
If I were the MC, I would make sure he won't get any sleep until the project is finished. After that one side accusation, say good bye to your sleep time!
That grandpa is the source of all evil in that family. I won't give him a proper burial if I were in that family. Put his corpse in a cement and throw it out into radioactive ocean near the nuclear power plant.
If it's not friend, why chibi shaped?