KAJISHIMA Masaki

In order to save the world from the side effects of Washuu's latest experiments, Masaki Tenchi goes undercover as a teacher. He is immediately swept up in a conflict between the student council and the science club, who each have a member that is key to Tenchi's mission. Source: ANN

From Viz: The trouble and fun began when ordinary teenager Tenchi Masaki inadvertently released the legendary demon Ryoko from his grandfather's shrine. Turned out Ryoko was actually a marooned space pirate! Since then, she's become Tenchi's unwanted houseguest, attracting a host of other troublemaking alien women: Ayeka, a haughty alien pricess; Sasami, her mischievous little…