When I heard the female star was a former gymnast who did all her own stunts, I was expecting some Jacky Chan-esque action; instead, all I got was some sword swinging and a cartwheel.

A girl who wants to be an action star gets isekai'ed into a parallel world, which desperately needs a hero... good thing she's trained her entire life for the role!
Yeah, it sounds cool and, though the tongue is firmly imbedded in the cheek throughout, there was a lot that could have been better, leaving my sole title word as a fitting description for this film: disappointing.