Take Exit 2 of Nihonbashi Station and go left along Sakaisuji, a main street.
After walking a little further, you will see Matsuya and Osaka Osho on your left, and across the street on the right you will see a 7-Eleven.
If you go further, you will see the Sugi Pharmacy, Dotonbori, and Kani Douraku signs on your left.
If you go a little further, you will see the bridge over the Dotonbori River.
Just after crossing the bridge, you will see a stone monument on the right hand corner of the Nihonbashi Kitazume intersection.
The building directly behind the stone monument is Lion Tower Shimanouchi. Take the elevator directly to the 3rd floor.