The first-year class learns they'll be participating in the once-a-decade Kouka Grand Sports Festival. A spark of jealousy and deep-seated resentment tear a rift between Chika and Chiaki.

When the Superiors grant a rare opportunity to Sarasa, the decision earns her the ire of the second-year students. Finding herself uncharacteristically nervous, Sarasa turns to Ai and her senpai for advice as the Sports Festival begins.