Guests from foreign countries approach to Shinjuku Sta. first. 

That is the easiest way to access to J-MEX.

Please take East Exit (Shinjuku Sta. is one of the largest station in Japan).  Then, you can find a digital signage (ALTA building).

Go past the buiding on the right side.  Next target is Don Quixote (variety store) in an intersection.

At the intersection, make a right turn.  Go straight until you get to a donut shop.  At the corner of the shop, make left turn.

After 3 or 4 blocks, you can see a restaurant that name is Squall.

Make right turn at the corner of Squall, then you can reach at J-MEX.  It takes 10 min on foot to J-MEX.