Gintama (銀魂）

Genres: action, adventure, comedy, drama, fantasy, science fiction

Themes: historical, parody
Plot Summary:
Twenty years ago Edo-period Japan suffered a great cultural
shock—the aliens called Amanto invaded the earth, overpowered the
nation's government, and outlawed the carrying of swords by the once
proud samurai. Moreover, the aliens took the people's jobs and are
currently running Japan as a sweatshop using the natives as laborers. In
this strange new era are Gintoki Sakata, an eccentric samurai whose
personal trademarks are his naturally permed silver hair, his love of
anything sweet, and his addiction to Shonen Jump; Shinpachi
Shimura, the teenaged heir of the Kakido-Ryu style; and Kagura, an
incredibly strong alien girl from the powerful Yato clan. The trio are
self-employed in an odd jobs shop called Yoruzuya Gin-chan, which offers
to do almost anything for a price, from finding lost kittens to saving
the world. Unfortunately, the jobs rarely go as planned, or pay enough
to cover the pain and suffering the employees encounter—never mind their
rent.