|Affiliation: House of Abe|
Tsuyuki is Yoshimasa’s wife and Masahiro’s mother. She knows about Masahiro fighting demons at night but doesn’t say anything to him because she wants him to tell her personally.
Later in series, Tsuyuki also teaches Akiko things that girls her age do, such as going shopping in the market and sewing.
She knows Yoshimasa very well; she could tell that he’s worried about Masahiro going to Izumo to kill the corrupted Guren even when he doesn’t tell her. Yoshimasa even went as far to say that the thought on how well Tsuyuki understands himself frightens him.