It looks like such beautiful place
MEAT mentions
Unagi Don is delicious and also hilariously expensive. Eel is very good when prepared by being barbequed.
Katsudon and Oyakodon are both interesting as they're also very tasty due to the inclusion of dashi when setting the eggs.
They've done some culinary crimes to spaghetti that I support. Japanese Curry is actually kind of its own thing, being more of a stew with a finishing roux. It is basically taken straight from India though I think(?) its become its own thing now.
Did they invent natto? That's not a good thing necessarily but they might've done it.