PSYREN -サイレン-

One day, high schooler Ageha Yoshina picks up a mysterious red phone card. Days later, his childhood friend, Sakurako Amamiya, who possessed the same card, suddenly vanishes. In search of her, he's drawn into rumors of a nationwide string of mysterious disappearances by a secret organization known as Psyren. When he accesses the group, a deadly game that changes his fate forever begins.