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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.
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.
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.