New student Mizuki Aonuma (Rina Sakuragi) faces relentless bullying from her classmate Aya (Eriko Nakamura) and others. Despite this, Mizuki manages to keep her cool. Kirie (Maika Shimamura), who is also a victim of bullying and has a reserved nature, becomes fascinated by Mizuki and admires her. The two form a close bond. Along with a boy named Shibanai (Syun Asada), Mizuki and Kirie decide to confront their bullies. However, Mizuki suffers a severe beating at the hands of Aya. Meanwhile, Kirie and Shibanai are attacked by teachers and subjected to brutal violence. Determined to seek vengeance, Mizuki roams the streets at night. During this time, she becomes possessed by the spirit of a toxic flower, unleashing the flower spirit’s madness.