KLASS CORPORATION revenue for the last year amounted to 9.78 B JPY, the most of which — 6.69 B JPY — came from its highest performing source at the moment, Professional, the year earlier bringing 7.14 B JPY. The greatest contribution to the revenue figure was made by Japan — last year it brought KLASS CORPORATION 9.78 B JPY, and the year before that — 9.89 B JPY.