Madou Monogatari III: Kyuukyoku Joou-sama

Rulue recognizes Carbuncle and jumps to the conclusion that Satan must have proposed to Arle, sending Minotauros to chase Arle into the forest. Arle escapes the forest dungeon but finds her hands torn and frostbitten from overusing Ice Storm. She heads into town for medicine, only to learn the raw materials are locked away in Mokemoe Labyrinth, recently overrun by monsters. Rulue sends Minotauros after her again, but Arle defeats him and discovers that Rulue herself had been filling the labyrinth with monsters, claiming the area as her own. The two strike a deal: Rulue will attend the same Magic School as Arle and learn to impress Satan through skill rather than schemes. The Game Gear version tells a very different story: a frog trails Arle throughout, Carbuncle falls ill and Arle travels to space to cure him, a new pink armor and powerful staff are acquired, an Egyptian Guardian appears early on, Draco Centauros shows up in a super form, and Rulue serves as the final boss. In the Game Gear ending, the frog is revealed to be Satan in disguise, who had engineered everything to win Arle as his wife — and both women promptly send him flying.