Misaki is the oldest daughter of the prestigious Tsusano family and the wife of Matsuki Takeru. She is also the mother of Mamoru, Hiroshi, Nagasa, and Izumo. As a skilled jijakalu and master of the Tsusano bloodline technique, the Blood Needle, she is one of the dual protagonists in the novel, which alternates between her perspective and that of her son, Mamoru. Following Mamoru’s death at the halfway point of the novel, she becomes the sole protagonist, and the narrative shifts to focus on the aftermath of Mamoru’s death and details Misaki’s efforts to rebuild her life and her family.

Misaki originally trained in swordsmanship with her father when she was a girl, and she also attended the prestigious international theonite school, Daybreak Academy. There she joined a group of teenage vigilantes and befriended Elleen Elden, Robin Thundyil, and Koli Kuruma. She was known for her stealth and her ability to ambush her enemies, which earned her the codename Shadow. She owns a zilazen glass katana called Siradenyaa, or Shadow’s Daughter. Though she loved Robin, she married Takeru to uphold her duty to her family.

Misaki is practical, ruthless, and headstrong.