One day in 20XX, the alien pig prince who planned to take a human body as his home arrived on Earth, but unexpectedly discovered that the human being he wanted to live in had not yet been born! The pig prince, who has nowhere to settle down, got to know Saiji and Rubi. The three pulled various funny pranks on humans, causing humans to have baldness, bad breath, headaches, emotional crisis and other problems.

Preparations for a new offensive against the Neuroi—a mysterious race of alien invaders—are well underway. The objective is securing Berlin, the capital city of the Empire of Karlsland, which is necessary for wiping out the Neuroi threat from Europe. However, as the enemy is capable of adapting to the battlefield on a daily basis, the allied forces and the current state of Striker technology might not be enough to achieve a victory. Meanwhile, Yoshika Miyafuji, a Witch from Fuso, continues her medical studies in Lausanne. Having recovered from a recent incident that deprived her of magical power, she is eager to assist in the war effort. The call to arms soon arrives and the scattered witches of the 501st Joint Fighter Wing must be gathered once again for a final push against the enemy. [Written by MAL Rewrite]

A misguided sci-fi tale of ecological police keeping space free from pollution in 2061.

This story is about Mick, a sleeping chironomid. Insects are taken up into space for use in experiments by humans. An epic space adventure of Mick and his friends of their journey back home to Earth. The development plans and experiments are aborted by humans for no known reason, the organisms are left behind in the space station with limited resources. Going over hurdles and fighting through challenges, together, they travel across planets and gain new comrades, heading for Earth. As their journey progresses, the mystery behind the human’s abandonment unravels… (Source: Crunchyroll)