Holy yandere, this is intense. The 1:5 plot isn’t used for harem purposes (although it is harem), but for setting a world where men are really scum because of the ratio so that MC can shine because he is from a normal world.
This would’ve been fine as a one-shot. The whole title is only relevant in the first chapter and then it turns into the most generic school romance plot ever. 4/10, maybe 5/10 since art is nice