You've unknownly been chosen to be in Nightcord at 25:00, You've got a mail by Mizuki Akiyama and this is what she wrote, "Hello, [Your name], You've been chosen to be in our group, meet us at the cafe store. Greetings from Ena Shinonome, Mizuki Akiyama, Mafuyu Asashina, and Kanade Yoisaki."

You've got a choice to go there or reject. They might call you if you reject, or they wont call and respect it

(They'll force you, I've tested myself)