Sushi Yoshino (鮨与志乃)
Sushi Yoshino is definitely one of the most highly regarded sushi establishment in Nakano ward. For the quality, the price is extremely reasonable. For an evening dinner with an "omakase" course (omakase means that you leave it to the chef), the prices range from ¥5,000 to ¥10,000. It's even possible to get an assortment of 13 pieces for just ¥2,500 for dinner. Go for lunch as well and you can enjoy a dish called "kaisen chirashi", which is rice topped with an assortment of sashimi, that is just ¥1,200. The restaurant is in Nakano ward but the nearest station is Nakano Sakaue.
Minehachi serves "Edomae" style of sushi, which is the traditional type of sushi of the Tokyo region which uses a sharper kind of red vinegar for the rice. This is a small and popular sushi bar, so it's better to make a reservation beforehand. The interior is simple and sleek. There is a counter with 7 seats from which you see the sushi master prepare each piece of your meal. Expect to pay around ¥8,000 for a course. With alcohol, and a more copious meal, the bill can add up to ¥15,000, but it's definitely worth it for the connoisseurs looking for the very best. Minehachi is located near Nakano Station's South Exit.
Shiyoro Sushi (松露鮨)
Shiyoro Sushi is a very local sushi bar that people love for it's laid back yet traditional atmosphere. The sushi master is affable and will take the time to talk about his sushi and will give you his recommendations based on what is in season. The restaurant has only 8 counter seats. Expect to pay ¥8,000-¥10,000 for dinner. Some options at about ¥1,000 are available for lunch. Located a 2-minute walk from Nakano Station's South Exit.
Sakae Sushi (榮寿司)
The truth is high-end sushi in Japan isn't necessarily expensive! There are some local gems that you might come across that offer really outstanding sushi at a mind-boggling cheap price. This is the case for Sakae Sushi. You can get an excellent nigiri sushi plate which includes uni (sea urchin) and ikura (salmon roe) for just ¥1,360. They have one item in particular that Japanese customers really rave about, and it's their "saba bo sushi" which is a mackerel rod-shaped pressed kind of sushi. You can get 8 pieces of that for ¥800. There is also a cheap drink menu. One cup of sake starts at ¥300. Sakae Sushi is located a 6-minute walk from the Nakano Station's North Exit.
Another honorable mention in the high-end category is this standing sushi bar called Niginigi. The tradeoff is that you sacrifice the comfort of being seated for some quality sushi that is worth much more than the price it is sold. Pieces are from ¥100 to ¥300. If you don't know what to choose, just ask the chef for an "omakase" (leave it to the chef) and he'll serve you an assortment of excellent in-season fish. You can also have drinks for about ¥300-500. Most people pay less than ¥3,000 here. This place is very popular with the locals. Located a 2-minute walk from the North Exit of Nakano Station.