Returning to Earth after the events on Rakuyou, Gintoki and the gang discover that the planet has become ground-zero for an intergalactic war over the energy reserves Utsuro has been controlling. Once again Edo is under alien rule and it falls to the Yorozuya and their allies to free the city and stop Utsuro once and for all.
Continues from where Rakuyou Kessen Hen left off with the same genre variety. Though it begins with a brief recap there’s little point in watching it without having seen most of the earlier entries in the franchise, starting from at least Gintama’.
More Information:
aniDB (1, 2)
Crunchyroll
Wikipedia
