It's a consommé soup with whole tomatoes. Eat the really soft tomato by breaking it down with a spoon.
I make tomato consommé soup quite often, but I really liked the texture of the tomato when I used a whole one.
It tastes better if you simmer at low heat for 30 minutes, let it cool then reheat as the taste will soak in.It's also great as a chilled tomato soup.
Enjoy Japanese food around the world.