Help Masters degree while working

I was wondering if there are any ways to do a masters degree in Japan while doing a full time job. Like evening MBA are there any universities which offer evening classes for masters? So that I can attend classes after work hour or the classes can also be on weekends. Basically are there any universities where I can do a masters without the class times conflicting with my job time? If there are actually any is there any know scholarships available for them?