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A catfish who became a swamp deity, and lives in a palace underneath her swamp with her many fish attendants. Ten years ago she fell in love with a young boy, and she asks Nanami to help her reconnect with the boy once again. As repayment, when Nanami visits her palace she allows her to wear one of her luxurious kimonos so she will look her best in front of Tomoe. Despite rarely speaking, Himemiko is very perceptive and seems to be one of the few characters who has figured out that Nanami is in love with Tomoe. Initially she appears very "fishy," with bulging eyes and a fishlike noseless face.

However after getting a makeover from Nanami, she maintains a more casual "human" appearance so she can meet the boy again.