Do you have any photos of the whole bike?
Knowing it's in Japan and seeing it covered with Oriental style graphics I can't help but think it's locally made.
I'll be passing the shop today and get a pic of the whole bike. The shop owner might be there and able to cast more light on the frame.
I'd be very surprised if it was Japanese. The seat stay eyes look English to me. I've seen the tulip shaped lugs somewhere else but can't remember where.
It's a track frame, by the way.