Im pretty sure that's what she's eating in the pic anyway. Maybe some Japanese anon can chime in.
This is the guy, hes still eating just stuff from sukiya but has branched out from just their cheese gyudon
https://soranews24.com/2024/12/11/one-japanese-man-has-eaten-at-the-same-beef-bowl-restaurant-for-over-1800-days-in-a-row/