I actually went to Kojima in May. It really isn't worth the trip as a shopper. Jeans Street is lame and a complete waste of time. The Momotaro Factory tour can be interest and the Kapital store is amusing visit as its connected to their factory + is huge for a Kapital store. If you're just looking to buy Osaka/Tokyo will be much better places.
9/15/15 at 5:52pm