http://www.youtube.com/watch?v=R39e30FL37U

Where on internet can I get one of this shirts?

BlindSargent said:

Where on internet can I get one of this shirts?

According to Shinos website this shirt was given out as a free gift for visiting Shinos booth at Summer Comiket, which was a month ago.
As far as I know it wasn't published outside of that, sadly enough.
Maybe he gives them out at the next one again?(I wouldn't count on it, though...)

Or, you can simply use one of the bazillion sites and stores that do t-shirt printing and make a unique one yourself.