Ai Japanese Restaurant, located in River North, features Chicago's only sake bar. A unique variety of tasting flights, allowing our guests to experience a wide array of sushi and sake, are signatures to Ai. Mon.- Fri. 11:30am-11:00pm; Sat. 5pm-11:00pm; Sun. 5pm-10:30pm Res. Accptd., Valet, Ha, $$$.