Ijimekaeshi. Fukushuu no Calendrier

Inspired by the thirty-one days of a calendar, the immensely popular idol group Calendrier was formed, captivating fans with their cheerful and energetic performances. Yet behind their radiant public image lies a dark reality hidden in the shadows. One specific member endures relentless daily bullying at the hands of her own groupmates, who enforce a cruel ultimatum: if she cannot smile, then the fans will never see them smile either. Stripped of her joy and pushed to the brink, she finally reaches her breaking point. Having suffered endlessly at the hands of everyone around her, she resolves to exact absolute vengeance upon those who tormented her. Her goal is no longer mere survival but total retribution against every single person who wronged her. She is determined to do whatever it takes to reclaim the genuine smile that her fellow members so viciously stole from her. With thirty groupmates standing as her targets, the stage is set for a harrowing reckoning. This is the chilling tale of the deranged thirty-first member, a girl who has transformed her endless suffering into an unrelenting desire for revenge against the very idols she once stood beside.