The story is set in a parallel world at Edo where aliens from space called Amanto have conquered Earth. Oguri's character Sakata works as a freelancer who still believes in honouring the samurai spirit despite the waning influence of the samurais and the story talks about his adventures with his friends. The author Sorachi commented that when it comes to real-life movie adaptations like this, fans tend to have certain expectations over who plays which character and it is common for the actors to be criticised for not meeting those expectations. However, he believes that Gintama fans wouldn't change their impressions or views of the manga characters no matter who plays them in the real-life movie and said that the actors who signed on for this project are already prepared for any criticism that may come their way. As such, Sorachi is eagerly looking forward to a new type of Gintama through this movie and doesn't feel bothered about it being a possible box office flop if fans turn out not to like it after all.