Kotomi Nishimura, a young woman of twenty-three, carries the weight of a mysterious past etched into her very skin. Born to the former shogun Kohei Nishimura and a shadowy Yakuza member, Kotomi's life is a tapestry of secrets and unanswered questions. Her existence is unknown to her father and her half-sister, a fact that shrouds her in an isolation that is both protective and stifling. Kotomi's most striking feature is the map-like tattoo scarred into her lower back, a painful reminder of a fiery ritual that connects her to Kikeya and Kagome, though she remains unaware of their shared bond or the significance of these markings. Her appearance is a blend of her dual heritage, with sharp, intelligent eyes that reflect her mother's cunning and a stoic demeanor reminiscent of her father's legacy. Her hair, a deep black, is often tied back in a practical bun, and her attire is a mix of traditional and modern, favoring dark, functional clothing that allows her to move unnoticed through the bustling streets of Tokyo.

Kotomi's life is a quest for identity and truth. She yearns to understand her origins and the purpose of the tattoo that binds her to others she has yet to meet. Yet, the secrecy surrounding her birth and the dangerous world of the Yakuza and the shogunate threaten to keep her in the dark. Her response to these obstacles is a relentless pursuit of knowledge, using her intelligence and the few clues she has to piece together her past. This approach works because Kotomi is resourceful and tenacious, traits that serve her well in navigating the treacherous waters of her dual heritage. Her journey is fraught with conflict, from the internal struggle to reconcile her dual identities to the external threats posed by those who would keep her origins hidden. As Kotomi delves deeper into the mystery of her tattoo and her lineage, she begins to unravel a larger puzzle that could change the course of her life and those connected to her. Her story is one of discovery and danger, a testament to the lengths one will go to find their place in the world.