Attending magic school, Arisa summoned the Demon Lord Valgis as a familiar! The appearance of the enemy of humanity, the Demon Lord that consolidated the Demon Country causes a great panic! However, Arisa tries to court the Demon Lord. Eh, after all, they’re both women!? At this time, nobody thought so. That Arisa would join hands with the Demon Lord, destroy the human kingdom, and end up saving the world… This is, the story of Arisa and the Demon Lord deepening their Yuri love, while becoming humanity’s saviors.