The High Priestess Alca has begun her attack on the Cave of Desire, leaving Keima with precious few resources for defending the dungeon. Even his secret weapon, the wolf monster Rin, isn't enough to stop her! Yet in the midst of this crisis, a more personal battle is taking place between Rokuko and Alca as they duke it out over who really owns Keima's heart. It's a fight for survival in more ways than one, but is it a fight Keima and Rokuko can win?!