Roc Chic
Google
When I'm in Tokyo, I look forward to going to this Natural House during lunch time for their hot prepped foods, soup, and brown rice sets. You choose and make your own combos. There aren't many choices, but the food is delicious and appreciated (hard to find decent, vegan food in Tokyo). You can take your lunch set to go or eat it at the communal table.
Unlike other Natural House elsewhere in Tokyo, this place is the only one that offers hot prepped foods and soups during lunch, along with cold, packed bentos that quickly sell out in the afternoon. Not all prepped foods are vegan, so be sure to look at the small posted signs or ask for help (staff doesn't speak English well, but with Google Translate's help, you'll manage).