What makes you think Japan wasn't Fascist ? It was a military dictatorship. All the Axis powers were explicitly Fascist, as were neutral Spain and Portugal.
I dunno if I'd qualify a military dictatorship as Fascist though, since the typical hallmark of a Fascist government is the singular leader who enthralls the public. Which I guess you could say the emperor, but I dunno, it doesn't hit the same way for me.