Decide Between the 12:00 Seating and the 20:30 Before You Book
An eight-seat Ginza counter where the tuna course is the reason to go and the Ruan Building's two entrances are the reason to arrive early.
The tuna arrives in four cuts, one after another, and the room reorganises itself around them. Sharp, red-and-white-vinegared shari underneath, cold fish, warm rice, a beat of silence between guests. This is what people book Sushi Arai for, and this is what it delivers.
Shinpei Arai opened the counter in the Ruan Building basement in 2015 after fifteen years in Tokyo sushi kitchens, eight of them at Kyubey, with visible nods to Sushi Shimizu in the way the shari is built. The room seats eight at a lacquered black counter and six more in a private room upstairs. The seatings are fixed, the reservation is among the hardest in the city, and the chef works the counter with the warmth of someone who knows every guest paid a real price to be there.
The tuna course is the reason to book and the shari is the reason it lands.
Editorial Deep
The white fish early in the omakase is the weakest stretch. It is precise, seasonally correct, and largely unmemorable — the kind of nigiri that would anchor a lesser counter and here reads as throat-clearing before Arai gets to what he wants to show you. If your seatmate is a first-time omakase guest they will love it. If you eat sushi seriously, you are waiting.
The Ruan Building sits on a Ginza block that does not announce itself, and the lift down to B1F is the first filter — miss the sign, take the stairs to 2F instead, and you are at a different counter entirely that shares the address and not the kitchen. Visitors have made this mistake often enough that it is worth naming. Leave ten minutes at the door.
The access model rewards the traveller who books six to eight weeks out, is willing to eat at 12:00 or 20:30 on a fixed clock, and treats the reservation as non-negotiable once made. It excludes the walk-in, the day-of planner, and anyone who wants to move a booking — changes are treated as cancellations and carry a fee. There is no Resy, no Tock, no OpenTable path in. Phone the restaurant on +81 3-6264-5855 if your Japanese is up to it. Reservations open one to two months ahead and the good slots go inside a day. Book the 12:00 lunch if you can — it is the same kitchen at a materially lower commitment.
The tuna course alone justifies the ticket. Four cuts of the fish that Tokyo counters compete hardest over, sequenced by a chef who has spent fifteen years learning what to do with them, on shari that is sharper and more distinctive than most rooms at this price. Whatever you paid for the seat, that stretch of the meal repays most of it on its own. The white-fish opening is where the value question sits — competent, not the reason you came, and priced the same as everything else in the sequence.
Order the same omakase the second time and the tuna course will still be the peak; what changes is what you do with the opening. Next visit, skip the sake pairing on the white fish and start the drinks alongside the tuna instead — the shari carries the earlier pieces without help and the pairing budget belongs on the cuts that reward it. Take the 12:00 seating rather than 20:30. Same kitchen, materially lower spend, and the natural light down the lift shaft flatters the room.
What to eat
Don't miss.
The tuna course — four cuts, sequenced
“Book the 12:00 seating six weeks out and eat the tuna course.”
The tuna sequence and the shari are the reasons to come; the white-fish opening is not. If the main counter is booked, the B1F room under sous chef Hiroki Usui is the same kitchen at a lower ticket and easier to secure.
The Verdict
