Everyone talks about expensive tokyo food but you can eat well for under ¥500 if you know where to look. Yoshinoya beef bowls are ¥380 and genuinely filling. University cafeterias in shibuya and shinjuku serve students and the public - ¥400 for massive portions.

Convenience store hot food is legit - karaage chicken ¥200, onigiri ¥150, instant ramen ¥300. That's ¥650 for a full meal. Standing sushi places near train stations do 2 pieces for ¥200-300.

Avoid anything touristy obviously but also skip the fake cheap places that charge ¥500 for tiny portions. Stick to chain restaurants and places with salary worker crowds.