a random app used for texting has appeared on six people's phones, they can't delete it. what would happen when they find out they go to the same school? or a xdinary heroes groupchat highschool au NO.3 in #gaon NO.3 in #jungsu NO.4 in #ode NO.2 in #junhan NO.1 in #gunil NO.5 in #jooyeon started- september 27th 2022 ended- october 7th 2023