Keishi Kameyama’s transformation is one of the most striking business reinventions in Japan. Once closely associated with adult entertainment, he is now widely seen as a major figure in the country’s startup and technology ecosystem.
His wealth reflects that shift. Bloomberg’s Billionaires Index estimates Kameyama’s net worth at about US$3.5 billion, while DMM.com has reported sales of around US$1.7 billion.
DMM’s business mix has changed sharply
DMM.com began as a major internet company known for adult content distribution, but it has since expanded far beyond that identity. Its businesses now include foreign exchange trading platforms, video games, online English lessons, and solar energy projects.
Adult content, which once defined the group, now contributes less than one-third of total revenue. That diversification has helped reposition DMM as a broader digital conglomerate rather than a company tied to a single controversial business line.
| Business Area | Current Role | Notes |
|---|---|---|
| Adult Content | Less than one-third of revenue | Former core identity of the group |
| FX Trading | Major business line | Part of DMM’s digital expansion |
| Video Games | Major business line | Supports the group’s broader portfolio |
| Online English Lessons | Major business line | Extends DMM into education |
| Solar Energy Projects | Major business line | Shows expansion beyond media and internet services |
A reputation that changed with the market
Kameyama was not always welcomed as a model entrepreneur. He faced rejection, difficulty securing bank loans, and resistance in business negotiations because of the stigma attached to his early ventures.
Over time, public perception shifted. He is now often described as a pioneer of Japan’s internet era and a role model for younger founders trying to build startups.
Support from prominent figures also helped improve his image. Takeshi Kitano, the well-known Japanese entertainer and filmmaker also known as Beat Takeshi, appeared in an advertisement for Kameyama’s startup incubator.
Recognition of his business role later spread into academic and media circles. In December 2016, Keio University students invited him to speak about investment in Africa and his support for young entrepreneurs.
About a month later, a popular Japanese weekly magazine gave him a special column on Bunshun Online, where he wrote about child-rearing and family relationships.
Why DMM attracts young talent
Kameyama’s reputation has also helped DMM’s appeal as an employer. In a Nikkei survey of university students, DMM was listed among the 100 best companies to work for in Japan.
The company was ranked above global technology names such as IBM and Google in that survey. Kameyama has said the appeal comes from a corporate culture that keeps experimenting and trying new ideas.
That willingness to test new businesses has been central to DMM’s growth. It allowed the group to move away from dependence on a single revenue stream and build a more varied company structure.
Outside work, Kameyama is known for a relatively modest lifestyle. Married with two children, he is said to still often ride a bicycle to the office.
He also tends to wear monochrome T-shirts and a thin beard, a look far removed from the usual image of a billionaire. The contrast between that understated style and the scale of his business empire adds another layer to his story.
His journey shows how stigma can fade, reputations can be rebuilt, and business fortunes can expand in unexpected ways. Kameyama’s path from controversial industry founder to startup mentor now stands as a notable example in Japan’s digital economy.
