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Aki Masuzu was a Miko of the Shikoku, originally from the Ehime Prefecture. She is in constant contact with the Shinju, but often complains about her duties (such as bathing in the waterfall to purify herself).
Aki Masuzu is from the same prefecture as Iyojima Anzu and Doi Tamako. During the initial Vertex Invasion, she guided them with her Miko abilities in using their Hero powers to protect the evacuating citizens.