It takes just 3 mins from the Ginza station which Ginza Line, Marunouchi Line, and Hibiya Line of Tokyo metro run through on foot. Although A13 exit is the nearest exit to the Ginza store, A13 exit is closed due to the construction.
Here is the direction from A12 exit which is next to A13 exit.
Mitsubishi UFJ bank, MUFG, is across the street when you go upstairs from A12 exit. Make a right and walk straight to the crossroad; you will pass Matsuya Ginza department store.
Cross the pedestrian crossing, and…
You will find Apple store.
Pass the store and walk straight on the Matsuya street.
Turn the second corner.
Opposite side of the MUJI HOTEL GINZA,
You will find MOKUMEGANEYA Ginza store! The red logo of MOKUMEGANEYA on your head is the sign.