For the first time since Wakaba's death, Ko goes with the Tsukishimas to visit to the sisters' maternal grandparents in the mountains, where they are caught in a snowstorm. While trapped in the house, he and Aoba remember his past visits and playing with Wakaba. Looking through a photo album, Ko recognizes Aoba's uncle, a famous mountain climber, but not his son, Mizuki, who is the same age as Aoba. In the morning, Ko goes into the snowy forest to visit the tree on which he and Wakaba carved their names, which Aoba had then scratched out. He gets lost and Aoba directs him to the tree, where he discovers that Aoba had later carved replacement names. Back home, at the start of spring, Ko and Nakanishi see a strange boy climb up a drain spout to retrieve a woman's hat blown there by the wind. When Ko later visits the batting center, he learns the boy is Mizuki, who is moving in with the Tsukishimas.
若葉の母親の実家を訪れた樹多村家と月島家。アルバムを見ながら若葉が生きていた頃を思い出す光と青葉。翌日、若葉との思い出が残る木を見に登った裏山で、光は「あさみ みずき」という聞き覚えのある名の少年に出会う。その後、光は東と月島バッティングセンターに向かう途中で、その少年と再会するが…。
어느 겨울날, 코우와 아오바의 가족들은 와카바의 외할머니댁에 놀러 간다. 앨범을 보던 중 아사미의 존재를 떠올리면서 함께 보낸 시절을 회상하는 코우와 아오바. 다음날 코우는 와카바와의 추억이 있는 나무를 찾아가고, 아오바는 그런 코우를 뒤쫓는다. 겨우겨우 그 나무를 찾아낸 코우는 어떤 사실을 깨닫고 아오바에게 묻는데...
