Due to some complex reason, we didn't put Japanese version of the game on steam for a long time.
We are very sorry for that.
But now we have solved that problem.
Japanese version is currently online!
Anyone who have ever bought Japanese Box version from "Yuuhei Satellite" can get a FREE Steam version from http://jp.myacg.cc/
Just Login and you will see your Steam Key there,
We also fix some small bug, typo, etc.
Store pages in Japanese will come later.
Thank you.