Gin Tama, Vol. 2 by Hideaki Sorachi

[Viz] It's samurai vs. aliens! 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 Gintoki "Gin" Sakata do to make ends meet? Take any odd job that comes his way, even if it means losing his dignity. Fighting Should Be Done With Fists Love is in the air! Gin helps an escaped convict make amends with his daughter, fights a duel with the love-struck chief of the secret police, and tracks down a dying man's childhood sweetheart, who has seen better days...