There are four Johnny's Shop in Japan (Tokyo (Harajuku), Osaka, Nagoya and Fukuoka). You can look up the addresses from their website.

During my Japan trip, I visited the Osaka's Johnny's Shop branch. The new branch was recently relocated near Umeda Station.

They are only open from 10am - 6.30pm so it was really difficult to squeeze out time to visit the shop because that's when I'll be out sightseeing. However, since I was living in a hotel just across the street so it was pretty convenient for me to pop by the shop.
I dropped by the place at 5pm and it was empty. Maybe just a handful of us in there.    The security guard guided me to the door because the silly me couldn't find it. You'll have to climb a flight of stairs up into the store. Upon entering, you'll face rows and rows of photos. Arashi, SMAP, Tokio, V6, Kinki Kids, Kis-My-Ft2, KAT-TUN, NEWS, Hey! Say! JUMP, Kanjani8, A.B.C-Z...

Everything was in Japanese there so I wanted to ask the lady for help. Unfortunately, the shop helper couldn't really speak English either. I was left to fend for myself.

After you have selected your photos, you head downstairs to make your payment. They may also sell some leftover merchandise and I got myself a Yuto umbrella charm.

I left feeling really weird about the entire experience. It was bizarre but it could be because I don't particularly keep myself updated with them anymore.