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Haruka and the others hold a farewell party at the Sonoda household for Mitsuki and Rina, who have finished their exams. All of them give Mitsuki and Rina presents, letters, homecooked goodies and the like to congratulate them. At some point, just as Haruka and Yuu are cooking alone together, Mitsuki appears and refers to the two of them kissing, and her and Yuu get into a fight over it.

Mitsuki, a third year, retires as student council president. It is decided the new president will be the second year student, Otokawa Sumi. Upon hearing "I have a friend who wants to throw a graduation party" from Kaede, Sumi immediately shows up at Haruka and the others' classroom.

The rare snowfall puts Haruka in a good mood and she suggests, "Since we don't get this chance often, we should eat outside!" but next to no one gets on board. Haruka goes outside with Shizuku, the only one to agree, and they talk about things like "I want to treasure these three years" and "I want to engrave this sight into my memory."

New Years is fast approaching, and Haruka has a nice phone chat with Yu to rejoice. Later, Mitsuki becomes envious of her sister linking arms with Haruka.

Haruka is going to participate in a relative's wedding and invites Yuu in her dad's place as he'll be on a business trip. She tells a half-asleep Yuu "Do you want to go to a wedding with me next week?" who misunderstands, gets extremely flustered, and thinks it's the two of them getting married.

Haruka and the others come to the culture festival after-party at the heated pool in Kotone's home. Haruka sneaks a kiss in the pool, undergoes a swimming crash course, and has fun with everyone like always when Kotone's little sister Shinobu shows up.

In preparation for the culture festival the next day Haruka and the others make progress finishing the costumes for the dramatic reading. But, it doesn't look like they'll finish in time and everyone decides to sleep over at the school.

When Yuu dozes off in the classroom, Haruka isn't there when she wakes up. From what she hears from Shizuku, Haruka went with the others to a cafe. Yuu is shocked and becomes sullen, but heads to that cafe with Shizuku and Kotone.

Haruka and Yuu are as intimate as ever as it turns to summer, but Yuu has been worried ever since Mitsuki saw her and Haruka post-kiss shortly ago. Mitsuki has been prying into their relationship ever since.

Sonoda Mitsuki, Yuu's big sister and acting student council president, become curious what "Takayama Haruka," the girl Yuu keeps bringing up lately, is like. Meanwhile, Haruka and the others are shocked to learn that due to the number of students and costs, a small-scale ball sports tournament will be held instead of a sports festival.

Haruka and the others worry about Shizuku, who seems different this morning. Kotone tells them that she's actually staying at Shizuku's place, and that they had a fight the previous day. Though they want to make up, they each have their own complicated feelings and remain stubborn. However, Shizuku speaks to the others. She feels she can't leave things the way they are, resolves herself, and goes to talk to Kotone.

Haruka and Yuu are best friends, but when they get to high school their bond is tested and they become something more.