As you make your way down our black timber staircase or bronze framed glass lift, you arrive at MAGMA, an immersive subterranean space that reflects the dark volcanic insides of Mount Fuji.

Set below crisp black oak ceilings is an enveloping, lower ground floor dining room, mirroring the fires raging below. Sat below our terracotta tiled wall, MAGMA is lined with dowelled timber framed banquettes, bespoke dining chairs with orange leather and black with white chenille backs. Gyotaku fishes, a traditional Japanese art form, adorn our charred walls along with sculptural lights.


Anchoring the space of MAGMA is our traditional binchotan-charcoal-fuelled-robata grill.

Dine at the marble counter with burnt orange leather stools, overlooking the open kitchen, cooking over flames and using solid charcoal, producing dramatic and smoky flavours.

We invite you to explore our Robata highlights that cover a cross-section of meat, seafood, fish and vegetables.

Private Dining

A Submersive Private Space
A Submersive Private Space

Tucked away and separated by black sheer blinds with teal leather and chenille banquettes is our intimate Private Dining Room.

Featuring an ocean-inspired metal wall, dark timber joinery and bespoke wooden tables, our flexible private dining space creates a vibrant atmosphere, perfect for group dining.

Under our SHISHU embroidered panels depicting long-tailed birds that represent good luck and longevity, dine with up to sixteen guests and enjoy an experience bespoke to KOYN.

Japanese Sushi Restaurant Mayfair Grosvenor Square


Monday to Saturday
Lunch: 12:00 — 14:30
Dinner: 17:30 — 22:45

Lunch: 12:00 — 15:00
Dinner: 17:30 — 22:30