KLASS CORPORATION revenue for the last year amounted to 9.89 B JPY, the most of which — 7.14 B JPY — came from its highest performing source at the moment, Professional, the year earlier bringing 7.47 B JPY. The greatest contribution to the revenue figure was made by Japan — last year it brought KLASS CORPORATION 9.89 B JPY, and the year before that — 9.68 B JPY.