Helping with the potato harvest, going to see the beautiful Mt. Fuji... Nao begins to notice the changes in her own heart as she experiences the beauty of the changing seasons. Meanwhile, Nao and Aki are summoned by Sunao and Shuya, and entrust the rest to Mochizuki before meeting in Kyoto. Thus, the four, the originals and replicas, gather in Kyoto, but something seems to be amiss...

While enjoying her school trip, Sunao is unexpectedly confessed to by a classmate she barely knows. Feeling down after hearing what he said, she is approached by Sato. Faced with Sato's frankness, Sunao confides in him about the feelings she has kept hidden in her heart. Meanwhile, Nao, who is making the most of her time in Fujinomiya, is excitedly suggesting a "pillow fight"—a must-do activity on school trips—to Mochizuki and Aki.

Sunao and Nao head to their respective destinations: Kyoto, their school trip destination, and Fujinomiya, Ryo's hometown. As Sunao tours tourist spots with Akiya, Sato, and Yoshii, he gradually becomes closer to them. Meanwhile, Nao and Aki, who have arrived in Fujinomiya, are enjoying activities at a ranch when they unexpectedly run into a certain "senior."

While still grieving and shocked by Suzumi's death and Ryo's simultaneous disappearance, Nao is told frankly that she will be attending school from now on. Confused, Nao stays holed up at home when Ritsuko and Aki come to her and say, "Let's go to a hot spring."

The curtain rises, and the play of "The Tale of the Bamboo Cutter: A New Translation," for which Ritsuko wrote the script, begins. It proceeds as practiced, but towards the end, as they reach the scene where Princess Kaguya and the old women say goodbye, Nao notices Suzumi's feelings about the story and asks her a serious question that is not in the script.

The second day of the Seiryo Festival is the day when Nao, who is not usually on guard, attends school. Nao enjoys her first school festival with excitement and anticipation, from being made to wear a maid outfit to experiencing a haunted house with Aki. And then, just before the main stage performance, Nao learns about Suzumi's hidden past.

The day after her aquarium date with Aki, Nao is invited by her classmate Sato to eat lunch together, marking her first time having lunch with a group of girls. Later, in the library where she goes with Sato, Nao spots Ritsuko walking along with a troubled expression on her face—

Former student council member Suzumi Mori and former vice president Shun Mochizuki appear in the clubroom and inform Nao and her friends that the literature club is in danger of being disbanded. As they work on cultural festival activities to prevent the club from being disbanded, flyers hinting at the existence of doppelgangers are scattered around the school.

Standing stunned at the station, Aki honestly tells Sunao over the phone that Nao might be dead. Sunao is shocked and distraught. Under the tracks, they find Nao's school uniform, shoes, and a light blue scrunchie—

In order to get revenge for Shuya, Aki decides to have a basketball match against Hayase-senpai, a former member of the basketball club. Nao watches the brave match with Ritsuko. On the other end of the video call on her smartphone, who is providing commentary, are Sunao and Shuya—

Even after summer vacation ended, Sanada was worried when Nao didn't come to school for a while. Ritsuko told him, "Nao-senpai doesn't come every day," which made him realize something. A month later, when Nao finally came to school, Sanada asked her, "Aren't you Aikawa Honest?"

Nao declares that she will wear her hair half-up as a landmark when she comes to school so that Sanada will feel more comfortable talking to her in the classroom. Sunao goes on the school trip she was looking forward to, and Nao, who is back at school after a long absence, envies her classmates who are all excitedly reminiscing. Just then, Sanada approaches her...

Nao, a replica of Sunao, attends school in her place because she isn't feeling well. While spending time with her childhood friend Ritsuko in the literature club, an unexpected prospect shows up. He turns out to be Sanada Shuya, a former basketball team ace and classmate.