There was this Japanese H game I used to play some years ago that I need help finding/Identifying. It was like a cross between a Tower defense and Dig Dug where you need to protect some kind of dark wizard or necromancer by hiding him in a tunnel you dig. Knights and other kinds of heroic characters are supposed to funnel in and you have to stop them by sending your own minions like Succubi. I remember you could also capture the good characters and "break" them in a dungeon area so that they would fight for you. I also vaguely remember a version of the game where the Succubi would resemble Morrigan from Darkstalkers.