Kotomi Nishimura, a young woman of twenty-four, carries the weight of a secret lineage she knows nothing about. Born to the former shogun Kohei Nishimura and a mysterious Yakuza member, Kotomi's life has been shrouded in mystery and danger. Her appearance is striking, with long, jet-black hair that falls in soft waves past her shoulders, and piercing green eyes that hint at her mixed heritage. Her skin is pale, almost translucent, and her frame is slender yet strong, a testament to her rigorous training in martial arts and survival skills. A unique tattoo, a map scarred into her lower back by a fire burning blade, marks her as part of a larger puzzle involving her half-sisters, Kikeya and Kagome, though she remains unaware of this connection.

Kotomi's life in the bustling city of Tokyo is a constant struggle for survival and identity. Raised in the shadows of the Yakuza, she learned early on to trust no one and to rely on her wits and skills. Her desire to uncover the truth about her origins drives her, yet the secretive nature of her mother's world keeps her at arm's length from the answers she seeks. She works as a freelance investigator, using her skills to navigate the underbelly of the city, always searching for clues that might lead her to her father and the meaning behind her tattoo.

Her unique quirk is her habit of humming old folk songs when deep in thought or under stress, a melody that seems to calm her nerves and sharpen her focus. This trait often surprises those around her, offering a glimpse into a softer side hidden beneath her hardened exterior.

Kotomi's journey is fraught with conflicts, both internal and external. She battles the loneliness of her isolated existence, the fear of betrayal, and the constant threat of violence that comes with her proximity to the Yakuza. Yet, she persists, driven by a fierce determination to uncover her past and find her place in the world. Her story is one of resilience and the unyielding quest for truth, set against the backdrop of a world where secrets and shadows reign supreme.