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.
A religion is a belief system with rituals. The missionary kopimistsamfundet is a religious group centered in Sweden who believe that copying and the sharing of information is the best and most beautiful that is. To have your information copied is a token of appreciation, that someone think you have done something good.