Tenchi Muyou! GXP

Seina and his party are saved by the intervention of Lady Seto's ship, the Mikagami, and invited on board. Seto warns Seina that people of Earth origins are not accepted in the GP, so he must find a way to prove himself worthy of being a GP cadet or be sent back to Earth with his memories erased. Seina later encounters Ryoko, a space pirate, who wants him on her side. (Source: Wikipedia)