Island and City

Ryuhei and his friends witnessed a shocking scene of Kazuha, who calls himself a hybrid. They are forced to admit that the cult they are fighting against is more powerful than they imagined and that there are "people who are not human". One day, Ryuhei and Reina meet a high school boy and girl at their usual meeting place in the park. Ryuhei says he feels he has seen them before, but...