Tsubaki and Black Star are assigned the task of collecting the soul of the demon blade Masamune. When they come to the village where he is located, they encounter problems related to Black Star's past. The duo returns to the village after Masamune possesses the body of a young boy to confront him. Black Star manages to break the boy free from the sword's control and Tsubaki sends her spirit into the demon blade to confront the soul of Masamune, who is in fact her older brother.