After a mysterious white Garuda delivers a new Magic Ring and stone to Omokagedo, Medusa sends out Ghouls to attack a young boy who is suspected of being a Gate as Haruto finds himself facing Phoenix.

After finding out that Hiroki is the son of his old friend Mikiko, Haruto suggests that he watches over him until the Phantom case is solved. However, Phoenix attacks Mikiko instead of bringing Hiroki into despair and when Haruto realises this, he searches for his father.

Haruto discovers that Koyomi is the daughter of Fueki, but he keeps this to himself. Meanwhile, elementary school teacher Yoshikazu Kumagai, who comes to the Omokagedō to purchase an antique toy plane for his late son, is discovered to be a Gate when he is attacked by the Phantom Siren.