Novel of the second Gintama movie, written by Oosaki Tomohito, the same author of Ginpachi-sensei.
What would have happened if the Shiroyasha never existed?
Edo is thrown to chaos by a mysterious cause. Sakata Gintoki, now lives in a world where the future has changed, without him. What has happened to the Yorozuya?
Gintoki, who is now a ghost of the past, must once again carry the burden in order to save his friends. He must finish the biggest job ever, which may be the final job of Yorozuya.

The samurai didn't stand a chance. First, the aliens invaded Japan. Next, they took all the jobs. And then they confiscated everyone's swords. So what does a hotheaded former samurai like Sakata "Gin" Gintoki do to make ends meet? Take any odd job that comes his way, even if it means losing his dignity.
 
(Source: Viz Media)
 
Included Bonus Chapters: 
Volume 1: Dandelion (One-shot). 
Volume 2: Shirokuro (One-shot). 
Volume 24: 13 (One-shot). 
Volume 38: Bankara-san Ga Tooru (One-shot). 
Volume 41: Special Lesson.

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. It turns out that the movie pirate wasn't a pirate after all—it was an android time machine, and Gintoki has been hurtled five years into the future! Shinpachi and Kagura, his Yorozuya cohorts, have had a falling out and are now battle-hardened solo vigilantes and he himself has been missing for years, disappearing without a trace after scribbling a strange message in his journal.

Setting out in the disguise given to him by the android time machine, Gintoki haphazardly reunites the Yorozuya team to investigate the White Plague, and soon discovers that the key to saving the future lies in the darkness of his own past. Determined to confront a powerful foe, he makes an important discovery—with a ragtag band of friends and allies at his side, he doesn't have to fight alone.
 
(Source: MAL Rewrite)

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