Gintoki keeps beating up the demon king Tama.
Shinpachi and Kagura help…
But the Leukocyte King stops him, the demon king changes his face and this time Gintoki, Kagura, and Shinpachi start beating him up, they break his balcony in the process.
They charge towards him, but he deflects them revealing his true form. Kagura infected with the computer virus, has been turned into a pixelated sprite, he blasts them again and Shinpachi gets turned into a sprite from the waist down. Gintoki nicknames him Shintank after the Guntank.
The demon king blasts Gintoki, but the Leukocyte King saves him and they run away. They then resolve to stand and fight. The demon king arrives and they both fire power blasts at each other. They bro fist, and Gintoki runs to take out the Demon King, the Leukocyte King is overwhelmed and caught in the blast. He burns up his life energy to push it back, while Gintoki takes out the demon king.
The Leukocyte King is slowly fading away, a miniature Tama appears to save him. Gengai Hiraga shows up with the hammer and hits Kagura, shrinking her and then starts chasing Shinpachi.
The troops are facing a horde of viruses and the Leukocyte King shows up to lead them to victory.
Gintoki’s hair is falling out.
There was another trailer for the Amanto Invasion OVA.