You've probably never been up on it, but Shinjuku's Isetan actually boasts one of the more beer garden-worthy rooftops in town. The venerable department store is now setting up seating for imbibers on it throughout the summer, serving a Mediterranean-themed selection of edibles to go with all the sparkling wine, sangria and mojitos you can handle. Two varieties of two-hour drink deals with food are available, priced at ¥4,800 and ¥5,500 respectively, while online bookings can be made here. Just look out for foul weather, as this one closes in case of rain.
The beer garden is closed on July 1-3, 22 & 23 and August 2, 23 & 30.