Gakken is one of the largest publishers in Japan, with over 70 years of experience creating educational tools and materials. The workbook series for young children has been representing Gakken's publishing program for more than 30 years and has sold 40 million copies. Under the motto of "Learning is fun," its workbook design opts for a varied but carefully-focused series of activities, avoiding monotonous routine training. These fun and effective workbooks have been supported by parents for generations.