Murashita Q-Zou

I was bullied by everyone, so in return I'm going to slaughter them all. Taking inspiration from the 31 days of the calendar, the uber popular girl group Calendrier was formed. Behind the bubbly appearance, in the shadows, there is one member that is bullied by the others on a daily basis. "If you can't smile, then neither will the fans." She is willing to do anything to regain the smile that was robbed by her group mates. With 30 members as her opponents, this is the story of the crazy number 31.

One night, high school student Komatsu Yukari is attacked by a bizarre assassin named Portaombrelli. Before death strikes, the young man is saved by a strange woman who introduces herself as the 'Evil King', a being whose goal is to devour all the evil in the world. That being has the same appearance as Komatsu's older sister, Karen, who was recently killed by Portaombrelli himself.

In a group chat on a messaging application, you may find that one day there is an increase in the number of members. If you notice this, a "curse" begins that you cannot escape――. The curtain opens on a true urban legend!