Little known secret - if you can't get into Roka you can still eat their entire menu downstairs at Shochu. It is a little more cozy than upstairs even. Plus with the bar next to you, think of how fast your service will be for all those different flavours of shochu.
Honestly, I think that one of the most intoxicated afternoon / evenings of my last decade was spent in Shochu. Had a great time that culminated in me trying to order singing telegrams for the rest of the schmoo's that were stuck in the office still (probably not the best way to make friends with colleagues on a Friday afternoon).
Go there, have a drink, get a little crazy - but my only advice is to not show everyone where your secret tattoo is in the middle of the bar. Oh and be forewarned, that shochu stuff is POTENT!