Based on erotic game by acerola
The protagonist Melissa who was defeated by a hero and was appointed as a new demon king.
She, who was trying to walk along the way of coexistence with humans, invites Ruffia, the hero who came to say hello, to the demon castle.
However, Rufiah mistakenly activates the magic of the magic seal, and the three accompanies of Marina also have their power sealed.
After that, they found out that they could use the magic if they had semen.
Those girls who accidentally destroyed the demon king castle, while earning the money to rebuild the castle, they was on a journey to find a way to unseal this magic.