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, a shy, reserved and introverted lad by nature, rarely speaks in front of any of his classmates. However, one day, the anti-social Mitsuru suddenly finds himself being approached by Koichi, the most popular boy in his class who asks him to be his friend.

One rainy morning, Koichi finds himself as a victim of a tragic car accident as he and Mitsuru are on their way to school. However, to much of Misturu's bewilderment, Koichi stands up from the crash as if nothing has happened thereby leaving Mitsuru in state of extreme shock and confusion.

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.

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.