Lunch can be a good value at mid and high end places. Depending on budget, you can still consider a splurge at $50-$75 High-End Value Lunches in Tokyo but you'll often be quite full and can go lighter on dinner. Similar older thread Mid-to-High end Tokyo Food recs

My partner doesn't seek out fine dining on his own in Tokyo. The curry shop, ramen joint, and convenience store onigiri keeps him happy enough and all under probably $35 total for the entire day. There's a lot of good everyday food at reasonable prices. Sometimes people refer to it as B-kyu https://www.japantimes.co.jp/news/20...of-the-people/. Japan-guide's medium and high budget is very achievable walking into a restaurant off the street, especially if you see a small line of people outside or it is in a department store/train station https://www.japan-guide.com/e/e2410.html value bonus points if they look like office workers.

It is easier to secure a solo ryokan reservation on a weekday and weekday rates are often less expensive than the weekend. Kaiseki is also served at restaurants and some also do lunch specials https://stevejobko.com/4216.html

I specifically wanted to point out there's a few high priced train bento (ekiben) in Kobe, Osaka, and Kyoto which are luxury foods. I've seen the Kobe beef $100, $200 ekiben on live streams. I classify these somewhere between novelty, tourist traps, and gift fruit (perfect $$$$ fruit which people give as gifts, not eaten everyday). Ekiben are usually fun* and I generally keep it under 1,300 yen. Just didn't want you to get the impression that even the train bento is crazy priced. You can pick up a beer at the convenience store or bento shop, usually 300-600 yen, and have a drink with your bento on the shinkansen (generally no eating on local and commuter trains). *Train station Bento meals are the best!