- Yoshikazu Tanaka is billionaire founder of mobile games company, Gree
- The company is valued at $7 billion; personal wealth $2.2 billion
- Tanaka hopes his company can change Japanese society
- Mobile gaming sector one of few areas experiencing growth
(CNN)One of Asia's youngest self-made billionaires, 35-year-old Yoshikazu Tanaka looks the part of a young internet tycoon.