Haruka, Makoto, Nagisa, and Rei swim in their individual events. Rin becomes irritated as he remembers watching them swim back in grade school. Afterwards, the four Iwatobi Swim Club members must prepare for the medley relay.

It’s just about time to escape from Goran Academy and Ai is determined to leave with everyone in Class Q. However, Tanya doesn’t want to leave the confines of the school. Can Ai convince her to join them before it’s time to go?

Kanetsugu and Keiji continue to recount their many adventures when they were younger. Keiji asks Kanetsugu how he got to know his spear-bearer, Mosuke. Kanetsugu tells him about their meeting and the sad past that ended up connecting them for the rest of their lives.

December reveals Ros's secret. The party is shocked and glad to hear it. But Ros seems unhappy, and December thinks he knows why. He says that if Ros uses his power it will revive the Demon King, and so he orders Juli to attack again.

At Hitagi Senjyogahara's discretion, Hanekawa Tsubasa ends up living under the roof of the Araragi residence. Spending an evening in Koyomi's house, Tsubasa realizes that she had turned into Black Hanekawa the previous night.

Tomoko's mother tells her that her middle-school-aged cousin Kii-chan is coming to visit. Since Tomoko always acted the role of a smart, popular girl in front of Kii-chan in the past, she starts to think up ways to keep her cousin from finding out that her stories about her boyfriend were all lies.

The 24-hour tournament has finally begun. As the girls of C³ are fighting with all their might, Yura alone seems tense. Thanks to Yura's strategies and training, C³ wins their way through the early stages of the tournament, but when Yura grows so obsessed with winning that she fails to show the slightest gratitude toward her teammates, Yachiyo and the others increasingly lose their trust in her...