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.

After seeing Shiori and Jiro together, Natsumi and Sachi try to ascertain Akari’s feelings, but she’s vague on the subject. The girls want to give Akari a decisive moment and come up with a plan for a group date to a fireworks festival with Minami.

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...