The Great Fire of London in 1666 was devastating for a young woman called Anonasai, and her brother, Constantine. They mysteriously become immortal, and from this time on, she is known as the wandering assassin, and Hunting Bird. Her mask is her signature for her missions, making it difficult for authorities throughout many centuries to capture her. Anonasai becomes the most wanted person in the world. She is ordered by the Makino clan, of which her brother is the leader, to assassinate a figurehead in the fifty-first century as war rages between two countries. Throughout this mission, Anonasai connects with family, allies, spies, British agents, and her Japanese lover along the way. Will they help her? Or will they complicate her mission? Will this be her dead-end?