The red in the upper left corner is Sujiko. It's Ikura (fish egg still in the membrane sac) and soaked in soy sauce.
Nikogori is fish jelly! Totally good and a tiny snack.
Kazunoko Kombu! The few things listed above, are what you may get when you have a good relationship with the chefs. They start bringing out their home brew. It helps to drink a ton, because if you're drinking a soda, they won't bring this stuff out. It's reserved for sake drinkers since these small snacks exists to taste with sake.
Shibucho is no nonsense. If you look confused, the main chef will say, "No California Roll, no spicy tuna roll. This is sushi." It may seem condescending and plenty of people write bad reviews on the place, and it's not because of the quality, it's because there's no "Avocado covered rainbow, mixed with shrimp tempura upside down with Sushi paper roll". It's serious and how you might find sushi in Japan.