The rightful ruler of one of the many hell realms. Rikka was defeated by her rival and expelled from her realm, trapped in the form of a mephit as a means to humiliate her. Rikka is actually responsible for summoning the MC in a failed attempt to return home. Rikka eventually returns home and reclaims her throne with the help of Haven. In return she gives her word not to invade the MCs home reality, or that of Haven.