Ichinose Academy’s famous three-day, two-night study training camp has begun. Nariyuki and the students study hard at the boarding house in the mountains, but Rizu can’t stop thinking about her tutor.

When Nariyuki is walking by Mafuyu's apartment one day, she invites him in because she apparently had seen a cockroach. He goes inside and finds the place just as messy as it was during his last visit.

When Nariyuki goes to a festival, he runs into Uruka and strolls with her past the food stalls, helps Rizu deliver food, and takes an injured Mafuyu to Asumi's father's first-aid tent. In other words, as ever, he's a busy do-gooder.

At Nariyuki's house, Fumino is on her way out after a study session when he gives her a birthday present. However, when Fumino opens it, she's startled to find a bra. What was Nariyuki thinking?!

Parent-teacher conferences are being held at Ichinose Academy. Nariyuki intends to decide his major based on what would be best for his family. Meanwhile, that math professor appears at the Academy.

The animal-costumed Nariyuki's intrusion onto the stage brings Fumino's play to an ending that has the crowd on its feet. Meanwhile, business is booming at Rizu's class's udon shop.