It's an anthology with the theme of mother-son incest. Vol. 1 My Mother's Lover by Shiroishi NagisaThe Selfish Juliet by Mitsuka HattoriBoy-girl by Purupyon SaitouDive Into Mother by Koujin KishiImmoral...

A couple decide to move in together. That much sounds simple enough - except that it isn't when the whole apartment complex is crawling with zombies, werewolves, and succubi. He's a half-skeleton with a...