The point of view begins with Hakaze, a witch who ended up on a deserted island. Changing point of views, we now look at Yoshino and Mahiro. Yoshino and Mahiro were best friends, but one day Mahiro suddenly disappeared. Yoshino assumed that he found a clue to whoever murdered his family. Despite the close bond they had, Yoshino has no idea where Mahiro is. However, one day when Yoshino was putting flowers on Mahiros' family's grave, a woman questions Yoshino about Mahiro at gun point. According to the woman, Mahiro got involved with some serious issues that will inevitably put the human race in a catastrophic situation, and the Japanese government is desperately looking for Mahiro. Apparently some sort of "magic" is involved. What happened to Mahiro? And who is this Hakaze girl? What does Hakaze have to do with this?

World-class detective Kiyotaka Narumi’s last words prior to his sudden disappearance continue to haunt his younger brother, Ayumu. The cheeky 10th-grader becomes equally embroiled in the mystery of the doomed “Blade Children” when he is mistakenly named the prime suspect in a murder at his school. Led by Ayumu’s sister-in-law, Kiyotaka’s wife and fellow detective, Madoka, the investigation into the murder gives Ayumu a chance to clear his name. But in doing so, he not only uncovers ties to the Blade Children but also more questions than answers about who and what they are.