I've never taught at Nova, they require a bachelors degree to teach phrases like the big cheese, nature calls, and holy cow!, which I am lacking at the moment, but what Mike says is apparently the word on the street, concerning Nova.
I have seen their study materials, I do know what they teach, I do know how they advertise, and if this is your first time teaching, this may be your first shot at work in Japan... as long as Mike says, you pretend to teach questionable English to people who pretend to learn it, you'll be able to focus on your free time.
I'll say, if you do plan on staying in Japan, make sure you have backup plans, as I haven't read very good things about contractual obligations to English teachers.