My sister’s relatives run their own restaurant in Sapporo.
It’s a seafood restaurant called うにの村上.
It was a coincidence that my relatives and they are both from southern Hokkaido .
If you come to Hakodate, you can eat a lot of fresh seafood there.
Anyways I and my parents met my sister’s family at the restaurant for the celebration of her pregnancy.
And I really enjoyed eating uni ( sea urchins).
Now is the best time to eat it 
I highly recommend this restaurant !
It’s a bit expensive though.
