Fuyumine (直刀, Fuyumine)
Gave Naoto her present name and took her in.
Fuyumine's student. Magato "killed" him.
Fuyumine's former student. Taught her how to fight when she was still "Naoto".
Dogs: Stray Dogs Howling In The DarkEdit
Raised Naoto after finding her in a near death state. He t her how to fight and how to survive. Despite living together, they didn't have a good relationship. After Naoto found Fuyumine "killed" by Magato, she sought revenge by defeating Magato in a fight and took Fuyumine's name and sword.
Dogs: Bullets & CarnageEdit
Fruhling encounters a shadowy man in the manga who reveals to be a alive Fuyumine, but it's unlikely that Naoto knows this. It's later reveal that he used to work for Heine's "mother" and taught Magato and the original Naoto.