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Afternoon on the school terrace, a girl named Shana suddenly committed suicide. Her classmate Anji (played by Yuki Oshima) heard the chilling song Shana sang while committing suicide. The incident caused a media frenzy. The editor of the third-rate magazine "Monthly MASACA," Riku Nagase (played by Ryuhei Matsuda), and his colleague Taiichi (played by Yuuichi Iseya), after investigation, found the root cause of the incident: everyone who sang the popular song "My Flower" released ten years ago has committed suicide. Riku obtained a lead about Shana's boyfriend from her classmates, but when he arrived, the boyfriend had also committed suicide by cutting his wrists. Later, to experiment with the "contagious song," Taiichi had a group of high school girls sing "My Flower," and as a result, Taiichi committed suicide that night, and the next day, some of the high school girls also committed suicide one after another. Feeling the situation was urgent, Riku, along with the remaining people who sang the contagious song, sought help from the exorcist Housho (played by Hiroshi Abe) who possesses supernatural abilities...