A period drama set in 17th century Japan ten years after the Battle of Sekigahara, Gaiakitan tells the tale of of Sanada Yukimura assembling his team of ninja, the "Sanada Ten Braves." The story follows a mysterious and talented ninja, Kirigakure, who is reluctantly drawn into Yukimura's rebellion against the Tokugawa clan.

Takaki loves ranking the popular and beautiful girls at his school. The one standing at the top is the foreign transfer student Emilia Shutrause, and being a student from Europe, she is extremely popular among the male students at Takaki’s high school. Although he was just a spectator of this school idol, that would change when one day he accidentally bumps into Emily (Emilia’s nickname) and he finds out her secret…

Set within a ravaged world, a girl protects the people from these monsters is interwoven into this mysterious fantasy. This is a oneshot from the Moonsorrow Collection II. "Originial" doujinshi by the circle Moonsorrow.