In the dungeons, you can have several levels of difficulty. If you choose Rabbie Dungeon,and your a male, succubus will be there as a special boss. On advanced mode, you fight all of them at once, each specializing in different abilities. I think it's White-healer,black-normal,red-magic,yellow-bard,pink-combat. Anyway, ingame you can strip them by meeting certain conditions(ex. Critical smash[attack]). If you "die" in the game, you can have the option for that black-dress chick at the end,Nao, to revive you.