Gibo/YMMV


 * Complete Monster - Yusuke has no problem crossing the Moral Event Horizon if it means exacting his revenge on unfaithful women.
 * Jerkass Woobie - Your protagonist is supposed to be this, but he comes off almost entirely as a Complete Monster instead. Mio can come off as this in at least one ending.
 * Moral Event Horizon - Yusuke believes his own mother crossed it by screwing another guy, and in turn he crosses it with his sadistic desire to make every unfaithful slut who crosses his path suffer.