Kurou threatens to kill Shiro unless he can prove that he is not the one who killed Tatara Totsuka. Determined to prove his innocence, Shiro begins searching for anyone who can confirm his alibi on the night of the killing. Meanwhile, the Blue and Red Clans follow their own leads to the suspect, which all point to Shiro.

The Blue King, Reishi, accepts a proposal from Shiro to carry out an air mission to restrain the Silver King, Adolf K. Weismann. However, the mission is abruptly interrupted when the Silver King’s airship self-destructs. The following day, Reishi pays a visit to the Gold King, where he discovers the remains of the Silver King. In the meantime, an unknown force makes contact with the detained Mikoto.

The Red King, Mikoto Suou, is contacted by a man claiming to be the killer of Tatara Totsuka. By utilizing his power, Mikoto escapes his prison cell to hunt down the killer at Ashinaka High School. While HOMRA occupies the school property to conduct their search, the Blue King, Reishi Munakata, makes one final attempt to reason with the Mikoto.

The war between the Blue and Red clans intensifies as Mikoto and Reishi finally face off. With his memory restored, Shiro introduces himself to Kurou and Neko as Adolf K. Weissmann, the Silver King.

Shiro regains his memory and power as the Silver King. After evacuating everyone on the island to safety, Shiro sets out to settle his score with the real Colorless King. Meanwhile, the battle between Mikoto and Reishi continues, with the Red King’s Sword of Damocles slowly reaching its limit. With time running out for all sides, what fate awaits these four kings?