Paired with beautiful, outgoing gyaru Watanabe Akari for his high school marriage practical course, introverted Yakuin Jiro agrees to act the perfect couple so that they can score high enough to switch partners and be placed with their crushes.

Akari and Jiro each hear a rumor that Shiori and Minami won’t be switching pairs even though they’re A rank. Jiro asks Shiori if she plans to stay by Minami’s side forever. Meanwhile, Akari runs into Minami, who suddenly pulls her close to him and...

Jiro is in the bath wondering what had made Akari cry like that. Suddenly, a frightened Akari bursts in and makes a huge fuss. To help her feel better, Jiro does lots of things for her and the two grow closer. Then Akari asks, “Should we try dating, too?”

Their summer job ends with a test of courage event. But before that, Jiro’s kindness causes Shiori to let some of her true feelings slip. As Jiro wrestles with her words, Kamo mentions that he has the ability to rig the parings for the night’s event.

Akari, with her renewed determination, Shiori, whose heart won't stop racing, and Jiro, who is unable to find his answer... Since their summer job at the beach, their feelings have only intensified. Then, one day, Jiro runs into Shiori at a bookstore...