I’m not a fan of NTR, but it seems to me that the author wants to show us not a Harem, but a deeper concept: a mirror image of a hero and a villain, the struggle between good and evil (the harem with NTR is just part of this) The hopelessness of the choice of the main character. There are always consequences for every choice. For every action there is a reaction. I still wonder if the main character will finally be able to have normal sex with Meiko or will remain a loser. Hm. There's a lot to think about here.