The last time round we discovered Mydori Kaiten Sushi at Seibu Department Store (Building A) in Shibuya, and on this trip, a quick Google search led us to Nemuiro Hanamaru at Kitte Marunouchi.
Located on level 5, Nemuiro Hanamaru opens their door to hungry hordes at 11:00am; while the elevators only kicks in at 11:00am, the escalator starts their humming operations at 10:52am. Yes, not 10:51am or 1053:am, but 10:52am - and we are walking Japanese watchmakers' precision.
The restaurant is part of a chain from Sapporo, did you see the light bulb go off in my head? Sapporo 2016? Let's pray for it.