Arina is a member of her mountain village's Village Guard, known to everyone as the finest swordswoman in the village. She and her childhood friend and boyfriend, Yuuki, have always planned to end up together someday. Life in the village was supposed to be peaceful... But one day, Arina's body is suddenly overcome by a lust that won't go away. When Erika at the clinic examines her, she says the cause is a "Succubus Curse."
And there is only one way to suppress it - doing lewd things with Yario, the man she can't stand...

And so begins Arina's secret life, one she can't tell anyone about. Can she hold out against the pleasure...? Three endings await, depending on your choices.