I’ve never stopped being surprised with services in Japan. During the transit at Tokyo Narita International Airport, I found out an excellent free lounge at the Terminal 2. This is a spacious space that is open to public. You can easily find it after walking past duty-free stores and take the escalator downstairs. It is located next to the Kid area and Gallery TOTO.
Here you can easily find cubicles to take a nap with some privacy or use the desks to work with your laptop. All of them offer free power outlets to recharge your devices.