Kotomi Nishimura, a young woman of twenty-two, carries the weight of an unknown lineage on her shoulders. Born to the former shogun Kohei Nishimura and a mysterious Yakuza woman whose identity remains shrouded in secrecy, Kotomi's life has been a puzzle of fragmented truths and hidden dangers. Her appearance is striking, with long, jet-black hair that cascades down her back, often tied in a loose bun to keep it from her face. Her eyes, a deep brown, hold a sharpness that belies her soft-spoken nature. She dresses in a blend of traditional and modern attire, favoring dark, muted colors that allow her to blend into the shadows of Tokyo's bustling streets. A unique trait that sets Kotomi apart is her habit of humming old folk songs under her breath, a quirk inherited from her enigmatic mother.

Unaware of her father's identity or the existence of a half-sister, Kotomi's life takes a perilous turn when she discovers a scarred tattoo on her lower back—a map burned into her skin by a fire-bladed ritual. This tattoo, identical to those borne by Kikeya and Kagome, hints at a larger, more dangerous puzzle that Kotomi is unwittingly a part of. Driven by a need to uncover her origins and understand the significance of the map, Kotomi delves into the underworld of the Yakuza, seeking answers that seem perpetually out of reach.

Her journey is fraught with danger, as rival factions within the Yakuza vie for control of the map's secrets. Kotomi's intelligence and resourcefulness become her greatest allies, allowing her to navigate the treacherous waters of her heritage. As she uncovers more about her family, Kotomi realizes that the truth is more complex and dangerous than she ever imagined. Her quest for identity and understanding leads her to confront powerful enemies and make difficult choices, ultimately shaping her into a resilient and cunning survivor.

The conflicts in Kotomi's life stem from her lack of knowledge about her past, the constant threat posed by the Yakuza, and the internal struggle to reconcile her heritage with her desire for a normal life. As she pieces together the map and her history, Kotomi's journey is one of self-discovery and survival, culminating in a resolution that sees her embracing her destiny with newfound strength and purpose.