Gintama: The Final Chapter - Be Forever Yorozuya

劇場版 銀魂 完結篇 万事屋よ永遠なれ21 connected anime

When Gintoki apprehends a movie pirate at a premiere, he checks the camera's footage and finds himself transported to a bleak, post-apocalyptic version of Edo, where a mysterious epidemic called the "White Plague" has ravished the world's population.