Tsunami is the daughter of Tazuna and the mother of Inari.

Her husband died shortly after Inari's birth, and when Kaiza entered her life as a father figure for Inari, she couldn't help but invite him into her home. Like everyone else in the city, Kaiza's death broke her spirit. In the years following, she tried to protect Inari from the painful memories of the loss of his friend and mentor.