Try_hard
Will kei become just a hole? I'm not particularly opposed to the haren, in any novel, but if the woman will only become a hole, it's stupid, and don't say that the protagonist loves her and etc, it's wrong, it looks bad, and it feels bad (talking about the plot, since it feels forced) so it's up to the author if this becomes the current version of "Every hole is a goal"
I chose that the MC after this meet his grandparents in Japan because he could have met the supernatural in Japan besides Japan is famous for its supernatural in anime fiction or other. Oh yeah, don't marry mother and daughter at the same time because it's immoral and this includes the logic of Harem Fiction which doesn't make any sense at all because it's as if no one cares about the environment.