Hedoroba (2017)

Problems with the neighborhood? Grandmother Yang and her two slightly mentally challenged grandchildren solve them in their very own way. Her neighbor Kazuya not only has to take care of the clan's legacy, but also his disabled sister, and all of them have to deal with the Sea Snakes gang who wants to compete with the Yang family. Crazy, uncompromising splatter movie with a monster finale. Never mess with grandma.