After discovering Yotsuba wants to quit the Track team but can't tell her teammates, Uesugi disguises Itsuki to resign for her.

Uesugi runs into the Quintuplets while out shopping. They invite him to visit their new home with an ulterior motive.

The quintuplet's father attempts to convince Nino to come back with him, but Uesugi rides in to save the day and Nino makes a confession. The quintuplets then celebrate their exam achievements with desserts. Later, everyone enjoys a vacation at a hot springs resort.

Uesugi enlists the "real" Itsuki to help him discover who was impersonating her yesterday. After discovering a room full of Itsuki, he interrogates them one by one. Uesugi struggles to tell which quintuplet is which.

The quintuplets’ father tries to get Futaro’s classmate, Takeda, to take over as their tutor. They make a bet.

Ichika, Nino and Itsuki plot ways to make a move on Futaro during the school trip. Yotsuba is troubled by their change in attitude

With desperation increasing, things become tense amongst the sisters as well as with Futaro. For their elective tour on the last day of the school trip, the quintuplets decide to keep things fair by leaving the outcome to luck.