Friendship vs. love...!? A love-triangle romantic comedy about being caught between two princesses!! Shunsuke and Hinaki are childhood friends who entered high school together. They've always been good friends, but their new classmates mistake them for lovers?

The virgin elder brother, Okada Naoto, and the younger sister who's unware of the concept of chastity, Machi.
Machi, who often teases her brother who's never been able to get a girlfriend, and also a virgin of 20 years, with offers to fondle her boobs.
While the dominant one in the Okada family is Machi, the one that she's obsessed with is...?
(Watch the healthy brocon/siscon relationship that these high schoolers have in this ominibus of home and school life!!)

Koga decides to confess to the the school's most beautiful girl, Meguro. To his surprise, she agrees to go date him. But what surprises him even more are her following words: "I'm not a virgin."