The twins, Oona and Hooru, are girls who came to the house of Takeuchi Kou, a super-skilled JAV Actor. They look like normal girls but they're actually not. In fact, they are succubi who devour human sexual desires. The reason they are in Takeuchi's house is to be with their beloved Takeuchi Kou. However, a succubus can't fall in love with a human because of their species barrier. In order to make this possible, there is a way for a succubus to become a human - that is... to collect "Kintama" that can be obtained through not having an orgasm for a day. In order to get the "Kintama", they trick each other, make the other come, and interfere with each other. And so, this no horny survival battle begins