|Full Name||Katou Yakuna|
|Manga Debut||Chapter 149|
Katou Yakuna is the mother of Katou Mikuni.
She appears when Shouko and Ayumi visit the Katou household. Although initially appearing as a stern, upper-class woman, upon meeting Shouko and Ayumi, she pulls them aside and gets them to wear the kimonos she just made, and just being a regular mom. The two from then on always wear the same kimonos when they are at the Katou household.
- Her maiden name is Sewa Yakuna, which can be read as "meddlesome person".