The Art of Self-Defense (2019)

After he's attacked on the street at night, timid bookkeeper Casey joins a neighborhood karate studio. Under the watchful eye of a charismatic instructor, Sensei, and hardcore brown belt Anna, Casey gains a newfound sense of confidence for the first time in his life. But when he attends Sensei's mysterious night classes, he discovers a sinister world of fraternity, brutality and hyper-masculinity, presenting a journey that places him squarely in the sights of his enigmatic new mentor.