Touken Ranbu: The Movie.

A sage travels to the past and collects a set of eight legendary swords, which bring to life a gang of talented but dysfunctional young warriors. The warriors know that Nobunaga Oda was supposed to die at the Honno-ji incident in 1582, but in this timeline he didn’t. To revert back to the original history, the warriors must travel back in time to assassinate Nobunaga Oda.