1x09 - Knell

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.