When Akira runs away from the office over a trivial dispute, he unexpectedly bumps into his long-lost brother, Yui. Akira is delighted, but Yui behaves strangely, as little by little, the events of the past in their snowy home village are unraveled.

Kabane and the others try to bring Akira home from the ice castle, but are stopped by the power of Yui’s nullstone, and Akira is overcome with shock at the turn of events. Meanwhile, Inari and Nobimaru secretly go into action to claim the nullstone.