※Originally titled 'Challenged by My Best Friend's Sister: "If You Can Do It..." and Its Aftermath —While My Best Friend Burns with Pure Love, I Indulge in an Impure Relationship with His Sister—,' this work has been retitled. While the characters' relationships remain the same, the story has been completely revamped. Volume 1 is scheduled for release on October 18th from Shogakukan Gagaga Bunko.

Romance is pointless. Yuma, who grew up in a household with a cold, superficial marriage, himself once had a painful experience with a confession that was just a penalty game.

Romance is foolish. Suzuka, his best friend's sister, is fed up after constantly witnessing people around her passionately declare their love, only to be viciously cursing each other the very next month.

They have no interest in romance. But they are both interested in the bodies of the opposite sex.

This is a coming-of-age impure romantic comedy about two such individuals who, while forming an impure relationship beside others consumed by pure love, ponder their own identities and ways of life.