At Koi Sushi, the dining room's casual elegance provides a simple background where the menu of classic Japanese cuisine can really shine. In a dining room with stark-white walls and a handful of scrolls adorned with Japanese characters, customers can peruse a menu of favorite Japanese dishes, such as tonkatsu and chicken teriyaki. But the menu's main focus is sushi. In addition to assembling platters of nigiri and sashimi, the sushi chefs prepare more than 50 different rolls, including specialty maki that features everything from spicy tuna and avocado to lobster and mango.