5. Ayurved Kitchen
The order of the list above corresponds with the amount of times I've visited each place and I can say with some confidence that the best curry experience I've had is at Sapna. The chicken masala there is not only the best I've had in Japan, it's the best I've ever had. It's not that intense on the spicy scale (though extra chili powder can be added), but quality wise and flavour wise it is second to none. Sometimes you will get simple curries in Japan that are made up of just sauce and meat, which if done well can be OK. However, this curry couldn't be more different. It's cooked from the bottom up, combining chicken and masala with onions, green pepper, tomatoes, whole dry chilies and a variety of fresh herbs and spices. This is topped off with half a perfectly boiled egg and a garnish of sliced ginger. So if you're ever in Motoyawata and in the mood for Indian curry delights, check it out.
It's not just the masala that's good either – the saag, keema, and the mame (bean) are pretty amazing too (from what I've heard from trusted sources). I tend to go with the same dish (masala) every time, but will be road testing a few more curries there to make sure the right information makes it up here for interested parties (the sacrifices I make :)).
Also, the lunch set there is the best I've had in Japan and it's very reasonably priced too. One other thing, check out the spicy potatoes – that's some next level culinary spiritualism there.