How has the Japanese game industry developed? What impact have the changes in game hardware and the emergence of smartphones had on the game industry? There have been several studies addressing this question. Most existing studies, however, have primarily relied on qualitative research methods, based on surveys and interviews of respondents. In contrast, this study tackles the same question with a data science approach. Based on the dataset we developed, we verified existing findings about the size and scope of the industry (Console Game Industry) and discovered new ones. In terms of the number of companies involved in the industry, the 2000s represented the largest number.