Square Louvois is one of the quietest corners of the 2nd arrondissement, and the room facing it seats exactly eight. That scarcity is the point: Sushi B holds a single Michelin star in the 2025 Guide, and the only thing on offer is omakase, the chef's choice, served piece by piece across a pale hinoki counter. There is no menu to read and no table to hide behind — just chef Isao Horai, his knives and a refrigerated case of fish flown from Toyosu market.
The Kitchen
Isao Horai trained in Kyushu before taking the counter at Sushi B, and he works in the edomae tradition — fish aged, cured and brushed with nikiri rather than dunked in soy. He speaks French, English and Japanese, and narrates each piece as it lands. The lunch omakase opens around €78 and runs to €150; the evening tasting is €190, with a longer €280 version for a full dinner.
The signature progression moves from sashimi into nigiri: a square of squid (ika) scored so finely it turns silky, fatty tuna toro tartare crowned with caviar, then a run of nigiri finished with a hot tamago. Rice is seasoned with red vinegar and served at body temperature, the detail that separates a real sushiya from an imitation. With Horai's full name on the door, one star to its name and a market-driven case behind glass, the kitchen meets every test of a serious counter.
The Room
Eight seats face the chef under low, warm light; marble, upholstered stools and fine glassware keep the register calm rather than minimalist. Conversation stays low because there is nowhere for noise to gather — you hear the knife on the board and the chef's voice. Dress is smart; the pace is unhurried across roughly two hours. Because every guest is at the counter, there is no bad seat and no sense of a service rushing to turn a table.
Best for Solo Dining
A counter built for eight is the ideal place to eat alone, and Sushi B treats the solo diner as the default rather than the exception. Three things make it work: Horai sets the rhythm so you are never waiting, he speaks enough English and French to talk you through each piece, and the single-seating format means no one is angling for your stool. Picture a Tuesday lunch, the €78 omakase, the square of Louvois empty through the window — eating alone here feels deliberate, not lonely. It is equally strong for impressing a guest who knows their sushi.