I have a Kabuki. I believe the model name is Grand Kabuki. The brake calipers have Bridgestone prominently written on them, but otherwise there are no Bridgestone indications anywhere on the frame. The frame is very light. Too light really for my weight really. But there is no indication of what steel it is made of.

Mine has very different geometry from the bike above. Very short top-tube for a 22" frame. Short chainstays and the fork has very little rake. Makes for a very twitchy ride. Mine has cool riser bars on it, so it is an odd mix of track bike geometry and touring bike. Not sure what it was intended for, but I have mine set up as fixed and use it to haul groceries. I really ought to get rid of it though, since I hardly use it for even that.