One day, Kei Kusanagi notices a strange glowing woman by the lake. He discovers that the woman is actually an alien officer from the Galaxy Federation named Mizuho Kazami, and even more shocking—she's also his teacher! In spite of this setback, he and his teacher gradually get to know each other and a romance blossoms between them. However, soon enough, the principal of the school finds out about their relationship. The solution? Get married!

Together, the newlyweds must keep their marriage a secret, not only from Kei's high school friends, but also the Galaxy Federation. Onegai☆Teacher is the fragile but comedic love story of an alien and her student.

[Written by MAL Rewrite]

The story revolves around a girl named Yuuka, who encounters a being from the depths of the Earth named Chii-chan (a pun of chiteijin, the Japanese word for underground-dweller), and an alien named Ucchan (a pun of uchuujin or alien). The story follows their heartwarming and chaotic everyday lives together.

The Garadain Empire has exhausted the primary resources of their native planet, so they send different space expeditions to find a new world where to live. One of their main objectives is planet Earth. However, Zeku Alba, an alien scientist, decides to rebel against the imperial rule and flees towards the Earth, where he gathers a group of youngs gifted with the power of "psychogenesis", an ability that consists in creating solid matter from mental energy. The most gifted of the squadron is Isamu, a young orphan whose family was killed in the first attack of the Garadain Empire. He is able to generate the powerful robot Govarian, an armor with which he can battle the alien monsters and is able to regenerate thanks to the psychic energy of the pilot. Helped by two other robots created by his team-mates, Isamu, aboard the robot Govarian, defends the Earth in the long war against the alien invaders. (Source: Wikipedia)

Justice, and the enforcement of it, has changed. In the 22nd century, Japan enforces the Sibyl System, an objective means of determining the threat level of each citizen by examining their mental state for signs of criminal intent, known as their Psycho-Pass. Inspectors uphold the law by subjugating, often with lethal force, anyone harboring the slightest ill-will; alongside them are Enforcers, jaded Inspectors that have become latent criminals, granted relative freedom in exchange for carrying out the Inspectors' dirty work. Into this world steps Akane Tsunemori, a young woman with an honest desire to uphold justice. However, as she works alongside veteran Enforcer Shinya Kougami, she soon learns that the Sibyl System's judgments are not as perfect as her fellow Inspectors assume. With everything she has known turned on its head, Akane wrestles with the question of what justice truly is, and whether it can be upheld through the use of a system that may already be corrupt. [Written by MAL Rewrite]