Freshness Burger is, as its name implies, a burger joint serving burgers made with fresh ingredients. The burger chain also serves fresh drinks at reasonable prices too! Freshness burger is originally from Japan and now has many branches overseas such as in Singapore and Korea.
Tsubame grill is a famous chain restaurant in Tokyo which specializes in yoshoku menu. Yoshoku is a western-inspired Japanese cuisine commonly eaten both at restaurants and at home. Tsubame grill is especially well-known for the great "hambagu" (hamburger steak), one of the most popular yoshoku dishes you need to try out!
Yokosuka is a town located on the sea side in Kanagawa prefecture. It is quite well-known for having a big American and Japanese naval base. Because of the presence of the American Navy (20,000 Americans live in the area), hamburger joints are very popular. One hamburger type in particular called the Navy Burger became somewhat of an iconic food for the town. The Navy Burger is basically a massive hamburger with a thick beef patty. Many restaurants have their own variation of the dish. Rich toppings are often added to create these monster burgers.