Since the original plans to make curry were canceled because Tane suddenly got a fever, Yutaka nevertheless decides to go to the brothers' house to show he cares.
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.