High school student Asuka dies by suicide by jumping from the rooftop of her school, wearing a rat mask. Forty-nine days later, six of Asuka's classmates-Misato, Kengo, Takashi, Ryota, Ryota's girlfriend Saki, and Kanako-receive text messages reading Please come to classroom 3B at midnight tonight. I'll be waiting. Asuka. That night, Takashi, Ryota, Saki and Kanako gather.
