Riku is saved by two warriors, Rena and Youhei, who wield Jinki weapons designed to destroy Kanshu. During the battle, however, Riku finds a cocoon, out of which hatches a toddler looking exactly like Amane.
At the start of the series, high-schooler Riku Amami receives a cellphone picture from his dead stepsister, Amane, with a hospital in the background. When he visits the said building, he is attacked by electromagnetic monsters called Kanshu, which travel and reproduce using cellphone signals: if a human hears his cellphone giving off an eerie static sound, his body is then gruesomely converted into a Kanshu or suffers irreversible infection.