[Houraisan Kaguya]

Originally Posted by cabman11

You still haven't explained why he was sent to that world in the first place

Spoiler for Reason:

The MC (Makoto) was sent to that world because of an agreement between the parents and that Bug. The agreement was that the parents would be sent to the Earth in exchange that in the future, they would have to say bye to something precious to them, in this case, one of their children.