Transfer student Mizuki Aonuma (Rina Sakuragi) is bullied mercilessly by classmate Aya (Eriko Nakamura) and others. Nevertheless, Mizuki is always able to maintain her calm composure. Kirie (Maika Shimamura), who has a passive character and is also bullied, becomes interested in Mizuki and longs for her. The two become close. With a guy named Shibanai (Syun Asada), Mizuki and Kirie decide to stand up to their tormentors. Mizuki though is badly beaten by Aya. Kirie and Shibanai are assaulted by teachers and endure shocking violence. Mizuki decides to get revenge. She wanders the street at night. At that time, Mizuki becomes possessed by a poisonous flower spirit. Madness of the flower spirit begins.

Nobody knows where they came from. They parasitize in human beings, take control of them and change their bodies into hideous monsters (Necro-borg). The Necro-borg fight each other until the other dies. Where did they come from? To what end? Yuji and Kaoru, whom both have dark secrets within themselves, get caught up in the horrific battles of Necro-borg. What will their fate be?

Japan falls into chaos after the earthquake in eastern Japan. The Japanese government then learns from the American CIA that uranium is being smuggled in Japan. The anti-terrorism investigators led by Kenji Sumimoto (Atsuro Watabe) attempt to uncover the truth by tracking the wife of a company president who is suspected of being the contact for the terrorists. An undercover Korean policeman (Kim Kang-Woo) helps the case.