Wakasa is the legendary shadow seisai to the currently disbanded Hogougumi. Not much is known about her except that, as the kage no seisai ("shadow" wife) she handled the violent part of being kumicho Hogou's wife, while the physically weak omote no seisai ("official" wife) was the one to interact with Hogou, although both were considered his wives. Wakasa's extraordinary fighting skills - both barehanded and with weapons - earned her great respect, and many actually supported her for the position of seisai. She was killed in a fight against the Garyukai yakuza group, along with the rest of Hogougumi.

Although she was rumored to have had no physical contact with her husband and a strained relationship with the official wife, Wakasa and her were actually very close friends, to the point of the omote no seisai convincing Wakasa to keep the child she had conceived with Hogou. That child is Tsukasa, whom Wakasa entrusted to her friends, the Kozuki couple, before going after Mikaido Shiva, who had betrayed Hogougumi because of his obsession with Wakasa. After discovering the identity of her mother, Tsukasa gets very angry when other people positively compare her to Wakasa, as she feels that Wakasa abandoned her.

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