A series of flashbacks show Mitsuru recalling his trip to the beach and camping with Koichi last summer, a memory that remains precious to them both.

As the two lovebirds come closer, Koichi finds himself spending the night at Mitsuru's where the two embrace each other and Mitsuru's warmth and affection brings a sense of calm and peace to Koichi.

One morning, a classmate of Koichi and Misuru discovers their teacher is standing on the roof of their school building about to take his life. As the students attempt to dissuade him, they accidentally discover the secret the teacher has been keeping.

On the third day after Koichi's accident, Mitsuru notices that some people have started to lose sight of Koichi, which thereby forces him to face the inevitable fact.

Mitsuru doesn't go to school because of a fever, but Koichi suddenly leaves the classroom during second period, which makes Mitsuru anxiously search for him.

The fourth night after the accident, Koichi goes to Mitsuru's house to stay over, and the two of them share an evening that they will never forget.