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.