Where do I find the shop where a girl asks you for tuna?
by chance
You can get a an item called "Sushi Pudding" from slaying cat slimes I believe. If you "use" the item; it flies away and the next area you visit will have the shopkeeper.
just follow the way it goes. i think
60% chance in hot day
https://docs.google.com/spreadsheets/d/1fDTga-dhWarmZjoPLGN9X85UqCQwDj1L9NpInVcVVLE/htmlview?gid=1649801404#