To escape the enemies targeting Fukiya, the death row prisoner they're guarding, the Boy Detectives' Club takes refuge in the abandoned building that Kobayashi had once been using as his base.
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.