I first encountered these tarts in Hong Kong last year - the chain exploded all over Asia, quite recently and when I say encountered, I mean I found the store, saw the insanely long queue, queued in it for about 20 minutes but then bailed on it when the staff member announced that the back of the queue could expect to wait up to 2 hours.
Luckily the queues, at least the Shinjuku Branch, where not that long. Had I tried these tarts before my last Hong Kong trip then I would have gladly waited in that 2 hour queue! Seriously this is easily in my top 5, probably top 3 things to eat in Tokyo! The Shinjuku branch is at Shinjuku train station, so hopefully if I get a chance to go to Tokyo again, I know as soon as I get off the plane, Bake Cheese Tart is my first stop!