We don't have an overview translated in English.

This is a DVD-only episode which is an epilogue to the main storyline set in 1936, four years after the plane crash. Kazura is back in Tokyo and receives another mission. Meanwhile, Yukina visits Natsume's family to give back his belongings.

Sakurai orders the group to investigate an opium den which is said to be a hideout of spies. However, something went wrong with Yukina's abilities. As a result, she tried to figure out the events that had happened when she entered the den.

A special recap episode which includes additional information on the main characters.

This is a DVD-only episode, designated as episode 0.