There is an other very nice Japanese restaurant where I love to go in Paris. It's in the Japanese neighborhood near the Opera. It's a very nice place. The restaurant looks like an old Parisian coffee, but the meal and the cooks are all Japanese.
For lunch you can choose the "menu", and taste a small starter usually fried meat (today it was karaage), then an onigiri (Salmon with shiso), and a big bowl of udon pasta (hot or cold).
But you can also choose meal from the menu and try tonkatsu, donburi and more.