Yahoo! in Japan started a new Game Project where you can enjoy more and more high quality games using your smartphone and your PC browser.
The new cloud and HTML5 based game system going to includes games like the Final Fantasy XIII and the XIII-2 and the Yokai Party (SP), Neko Pang! (SP)

You only need a PC browser or a smartphone with a Yahoo! Japan ID to try it within the closed Beta Test which started today and runs until June 12, 2017 (15:00 local Japan time).
Based on the feedbacks, Yahoo! maybe going to do some radical changes until the official service start so please give a feedback after the test.