Naganawa Yoshino, who suffers from extreme stage fright and social anxiety disorder and has never had a proper friend, repeats the same mistake right after entering high school and ends up fleeing to the bathroom... However, her classmate Shirase Futaba happens to hear Yoshino unconsciously humming a song in the bathroom stall and feels a deep connection! As more unique companions appear one after another, Yoshino decides to form a punk rock band with them──!! Based on the four-panel manga (by Najimi), the four main characters run wild in chaotic fashion!?