This white tee has its design on the back instead of the front.
It has high jump-kick Modern Sonic in a orange circle with blue border. He's all done in blue ink without any other color. The whole design is also really suffering from the 'faux wear' weathering effect that was popular for a while to make it look old and grungy on purpose.
The text at the bottom is in Japanese, and it says "Too Easy" or possibly "It's Too Easy!" This was a UK website exclusive and may have come in other colors, but always with this same weathered design. This is likely to be a 2015 or even 2014 item. (Before Boom really shut down modern clothing for its time period)