Are you unfamiliar with Rakuten? It's like Amazon for Japan. Some people might also consider Softbank (the mobile phone division) and SBI Securities (its securities division, under 'Strategic Business Innovator Group'). How about Line? It's the biggest mobile chat app in Japan.
Other people can comment more on this one: The number of small start-up game studios must be astonishing. Japan seems to have an endless appetite for video games! For publishing, they will team-up with a major, like Sony.
Other people can comment more on this one: The number of small start-up game studios must be astonishing. Japan seems to have an endless appetite for video games! For publishing, they will team-up with a major, like Sony.