Japanese efficiency and really decent cost! Flew RT Narita-Sapporo Sept 2014 and loved it. English website that was understandable. Every employee super nice and since I was the only non-Japanese on the flight, did all the announcements in English as well as Japanese. No Frills and they mean it.
Get to the airport earlier: Plan to arrive at the airport at least two hours before your flight is scheduled to depart. Low-cost airlines will not wait for passengers who are late, as regular airlines do. Check-in opens 2 hours before departure and closes strictly 40 minutes before departure.