Tatara Tani, a rather unremarkable individual, finds himself in a peculiar situation where his childhood friends, the popular idol Yuriko Hanazono and her stylish twin, Ranko Hanazono, attend the same school as him. Despite causing jealousy in others due to his close bond with them, Tatara's world is turned upside down when Yuriko, in disguise as Ranko, invites him to an amusement park, breaking the idol dating rule. As the school catches on to the deception, the real Ranko steps in to salvage her sister's image...by pretending to be Tatara's girlfriend. And so begins this whirlwind romantic comedy full of misunderstandings and mishaps!