The office members help a love-stricken client track down the object of his affection, and Kabane learns a lesson about love. Akira decides to pattern himself after Kabane, and the two are assigned to investigate a deadly case on the Shibuya River.

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.