After his family is brutally murdered, a kind-hearted boy named Tanjiro Kamado resolves to become a Demon Slayer in hopes of turning his younger sister Nezuko back into a human. Most films in the series are compilations of episodes, with interweaved new footage and special end credits. Mugen Train, initially its own film, was split up into the Entertainment District arc. It was a huge commercial success, grossing over $500 million worldwide, and becoming one of the highest-grossing anime films of all time.