All I can say is that it’s near the Shinkansen platform. This is where I accidentally found it twice. There is also an information desk where you can ask and they will probably give you a map and save you hours of frustration. Ok maybe I didn’t spend hours looking for the suica penguin store but I did look for it on two occasions and failed to find it. I spent around 30 minutes each time – after that the crazy maze that is the underground mall at Tokyo station starts to become suffocating. Worth it though if you do find this store!
Yes, that wasn’t even the same year, because he had the Christmas outfit on. I do it every time. Excuse the awkward cropping, I tried to make it look like I wasn’t sitting on the floor (all bow before Suica penguin’s almighty cuteness) making a fool of myself.