A case of mistaken identity throws an idealistic American into a Yakuza war where he has to navigate a brutal and cultural divide to survive

Thanks Heather... sorry but I thought 'Yakuza' was a main-stream term these days. Yakuza are the Japanese version of the Mafia... I do like the word 'propel' though... strikes me as a softer version of 'throw' which implies a longer journey before he plays a part in this war.

Perhaps explaining to those such as myself what a "Yakusa" is, would make clearer the logline. "A case of mistaken identity propels an idealistic American into a war with [ FILL IN ].