Gintama Complete Series — Direct Link

The story takes place in an alternate version of Japan's Edo period, where aliens from outer space, known as the Amanto, have invaded and taken over the country. The Tokugawa Shogunate, the ruling government, has formed an alliance with the Amanto, allowing them to coexist with humans. As a result, many samurai have become unemployed, and the main characters of the show are part of a group of freelancers who take on odd jobs to make ends meet.