Tatsuko Seriko was born outside the Yurami clan but was raised by the members of the clan and grew up training as a samurai alongside her male peers. She was known for her exceptional skill with a katana and her unwavering dedication to her clan. Tatsuko caught the eye of Araki Seriko, a fellow Yurami samurai, and they fell in love. After getting married, Tatsuko continued to serve the Yurami clan as a samurai, refusing to let motherhood slow her down. She gave birth to a son, Kazuo, who she adored but never let her love for him compromise her duties as a samurai.
Tatsuko was known for her no-nonsense approach and her unwillingness to compromise when it came to the well-being and protection of the Yurami clan. She was often seen training with the younger samurai, passing on her skills and knowledge to the next generation. Despite her fearsome reputation as a warrior, Tatsuko had a softer side that only those closest to her ever saw. She loved to read poetry and spend time with her family, even if it was just for a brief moment between battles. Tatsuko was admired by many in the Yurami clan, not just for her skill as a samurai, but for her unwavering loyalty and dedication to the clan's cause. She continued to serve the clan until the day she died, leaving behind a legacy of strength, honor, and devotion.