New game possibly under development?

So i was browsing pixiv for yukkuri pics and i stumble into this:

http://touch.pixiv.net/member.php?id=15278126

There is a pic(the latest one at the time of this post) where he mention something about a game, is this old news then if so do we have any other info about this?

I remember stumbling over this stuff once before, but I have no idea how old it is nor if it's work for a game or just something he's doing for fun.