Now I am not familiar with the US or Japenese Criminal Code but there must be something that criminalizes such behavior, but prosecution is at the discretion of the DA (or in this case where the incident crosses international borders even the US Attorney could prosecute)
[citation needed].
It's actually fairly rare for such awards in the US, according to all data i see. (certainly, they get highlighted by the media, but seem to be uncommon, since the average is something < 100k from the law review articles and data i can find )
Where are you licensed that the usual is multi-million?
One hundred thousand dollar sounds right in the ball park for General damages in usual cases though it'll increase depending on how much publicity the accusation got or if business reputation was harmed. That's just general damages. There's also attorneys fee in two countries and then there are special damages (economic harm caused), and finally, pre and post judgment interest.
Add on top of all that possible punitive damages imposed by a jury. I am a lawyer in India but these are usual common law principles followed everywhere.