My son (aged 6) is obsessed with the Lego Ninjago stuff so when I found out about the ninja restaurant we decided this would definitely be worth doing. We took others' advice and asked our hotel to book for us (the restaurant's online reservation didn't work for us). We got a 5pm booking, and arrived promptly for that. Our ninja waitress was really nice. We both got the Y5000 tasting menu, which had 8 courses including dessert, and our son got the kids tasting plate which was Y3000. We found both great value - it's a show and a good meal! As others have commented, food was really good, and lots of thoughts have been put in to come up with these menu items, as they were all quite unique. There were a couple of things that weren't quite my type of food, but it was certainly interesting to try. We got fake beer for my son and some non-alcoholic drinks for ourselves.
The restaurant is a little difficult to find, but if you look for the massive Tokyo Plaza hotel, it is just at the ground floor of that. Look at the restaurant's website and memorise what the outside looks like, and you won't miss it!
PS my son loves this meal - he got a couple of nice photos with the ninjas and even a headscarf for souvenir!
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