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Tatsu Yamashiro becomes Katana after her husband Maseo is murdered by his brother Takeo with the legendary Soultaker sword. Driven by grief, discipline, and the voice she believes still lives within the blade, Tatsu wages war against the Yakuza, Kobra’s growing influence, and the criminal systems that try to use her as a weapon. Across three seasons, the series follows Katana’s transformation from revenge-driven widow to master warrior, as Lady Shiva forces her to understand that true discipline means choosing when to fight — and when to walk away.