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Knowing that Yumi's real father, who was raised as a traveling entertainer, was a ninja, he himself follows the path of ninja. A ninja who moves with a one-time secret mission, Yumi's secret mission this time is to infiltrate the shinobi Genzo Aoba and steal the secret letter. Yumi is caught infiltrating and forced to obey as much as possible, but an even harsher fate awaits her...