The Ring virus is mutating, and Ando, a medical doctor, must choose between possibly betraying his species and bringing back his drowned son. You don't know what the Ring is yet...

"I'm going to uncover the mystery of the 'Blade Children.'" World-class detective Kiyotaka Narumi's last words prior to his sudden disappearance continue to haunt his younger brother, Ayumu. The cheeky tenth-grader becomes further embroiled in the mystery when he is mistaken for the prime suspect in a murder at his school.

Hiyono's gamble has bought Ayumu some time, but is ten minutes long enough to reason out an effective plan? Ayumu kicks his mind into overdrive, orchestrating a series of wave attacks designed to overcome Kanon's incredible fighting skills. But should any member of his already battered team miss their mark, it could mean death for them all. As the players move into position, Ayumu stands to face Kanon in what will be their final showdown.

The battle with Kanon may be over, but it's going to be some time before Ayumu and the others fully recover from the ordeal. As the police and media casually sweep the entire incident under the rug, Ayumu realizes he's no closer to solving the mystery of the Blade Children. But a month in the hospital is a prime opportunity to gather information from his fellow inpatients, who seem ready to confide the secrets of their curse. A dark and dangerous path lies ahead... Has Ayumu grown strong enough to face it?

Ayumu Narumi aggressively pursues his goal to unravel the mystery of the "Blade Children." With every step he takes, though, the path to the truth becomes more treacherous as a conspiracy is reveled. Could it be that Ayumu's fate was intertwined with that of the Blade Children even before his journey began?

When one of Ayumu's teachers promises to give him a few clues about the Blade Children, the deceptively cute Rio, one of the Blade Children herself, ruthlessly murders the man in broad daylight. Faced with another brutal murder to solve and one step closer to finding out what the Blade Children really are, Ayumu and Hiyono find themselves the direct targets of Rio's malice.

To save the kidnapped Hiyono, Ayumu must match wits with two murderous Blade Children... and his genius brother! The showdown between Ayumu Narumi and the Blade Children duo of Rio and Asazuki enters stage two when Hiyono is kidnapped and an intricate challenge involving perfectly timed bombs and blackmail is set before our unlikely hero.

After a near-miss with a bomb-collar, Ayumu attempts to have Rio of the Blade Children arrested and is instead threatened with the prospect of ruining his genius brother's reputation as his sibling's sinister ties to the group are further unveiled. When Kanone, a hunter of the Blade Children, hits the scene, Blade Child Eyes Rutherford attempts to enlist a fellow member and sprinter, Ryouko, in his cause.

With Kanone ready to start hunting down the Blade Children one by one, Ayumu finds himself in the thick of things as the hunter vies for his allegiance... at gunpoint! But even when both Eyes and Rio are in his deadly sights, Kanone's plans are thwarted by his own promise to not harm any non-Blade Children when everyone's favorite school newspaper reporter, Hiyono, stops him in his tracks!