"One 19-year old girl who technically cannot drink alcohol in Japan gladly tells the camera that the most expensive bottle of booze she bought in the bar was a Magnum Decanter of Louis XIII Cognac. For this she paid US$110 - in cash!"
That seems very cheap for a host bar!
US media not exactly renowned for reporting foreign news!
As far as an investigation goes, don't hold your breath, depends who is really responsible for this tragedy, or whether a convenient scapegoat can be found.