退会の手順 https://docs.google.com/presentation/d/1DzmwCULQF3e2zzBOBs4SKhbyt5UDkqR2wzKR8uzBvu0/edit?pli=1#slide=id.g2724d67ba31_1_995 休会の手順 https://docs.google.com/presentation/d/1DeGqKWLRJ9-SFX6CVTIWrDEpAXGfETJZJzANrD8ys70/edit#slide=id.p