Masayo is a Ninja member of the Katakuri Ninja Clan in Inotakimura, Japan.

In 1968, Masayo was on patrol until 8:00pm. During this patrol she overheard The Director talking about how he must manipulate clan leader Isako into doing his bidding, she notified the assistant administrator Haruko Muroi. Muroi responded that it would take more than hearsay to convince Isako. She advised to constantly provide Sake to The Director so that his tongue would be loosened and that he might slip up in front of Isako.

Cate Archer found the letters between Masayo and Haruko Muroi regarding their concerns.

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