In 1954. You are the leader of the ninja group of Uesugi family, and a mission has been ordered from your lord Uesugi Kagekatsu.
The mission is to infiltrate the Masuyama Castle in Etchu which is protected by Mitsushige Nakagawa of Maeda family, and take away "something".
The spirit of the former lord Kenshin Uesugi will support you as a guide.