Tenchi Muyou! GXP

After arriving at GP Headquarters, Seina is stunned to see Kiriko as an immigration officer to the GP Academy, and she begs him to return to Earth immediately; however, he decides to stay and is accepted into the academy. Later, he also encounters Seiryo Tennan, who hates Earth people with a passion, and Kiriko and Amane are assigned to the academy as teachers. (Source: Wikipedia)