Mahiro  

, 真尋

Mahiro is the sister-in-law of Muramasa, despite not being related by blood. They are like family, with Mayumi also included. Four years ago, when Mahiro returned home, she found Kyo beside her sisters corpse and holding a bloody sword. Driven to avenge her sister's death, Mahiro became a ninja under Tokugawa Ieyasu.