I took my Kona Private Jake with me (nowhere near that bike, but $2-3k) which I would expect to be gone in an instant in the UK. I kept placed my bike on the balcony of the monthly apartment in Roppongi, which was only on the 2nd floor, and would check it at night as I thought someone would nick it
This shortly progressed to leaving it outside when going to the conbini, etc