Futaro is hospitalized for a while after falling sick at camp school. He returns to work tutoring the quintuplets, only to realize someone has fallen way behind.

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.