Mizuho Nishino, an aspiring manga artist, has grown up with four childhood friends: Kizuki Hazawa, Shuugo Hoshikawa, Shin Kashiwagi, and Airu Izumi. However, on Mizuho's 17th birthday, Kizuki unexpectedly asks her to be his girlfriend. Lacking any prior romantic experience, Mizuho initially dismisses the request, but Kizuki is sincere and determined to win her affection. Kizuki stops concealing his feelings, leaving Mizuho hesitant as she worries about how a potential relationship might affect their entire friend group. As Mizuho navigates the confusion of adolescence, it appears that the other three boys have also fallen for her—and she must figure out her own feelings without breaking apart the tight-knit group she values so much.