A daily battle with a monster with strong sexual desires, Yuri lives with a humanoid demon named Kuro. Since Kuro is always crushing her in his arms, her days off are always ruined. Determined to take a rest this time, Yuri firmly declines Kuro's invitation and pretends to be asleep. However, as expected, Kuro is not satisfied and starts to throw a tantrum. When Yuri ignores him and pretends to be asleep, Kuro did something unexpected ......