I was once invited near Osaka to a Tonkatsu historic restaurant and I was impressed even though its not my kind of thing. Now here is a restaurant serving a curry version: https://maebashi-ponchi.webnode.jp and some say they are serving for more than 100+ years of service.

On the menu you’ll see Hayashi: Hayashi rice or hashed beef rice is a dish popular in Japan and usually contains beef, onions, and button mushrooms within a thick demi-glace sauce. This dish is served atop or alongside steamed rice and is lip smacking.