ቁልፍ ቃል Electric Shock

An alien race known as the Oni arrive on Earth to invade the planet. Instead of taking over the planet by force, the Oni give humans a chance to fight for the rights to the planet by taking part in a competition. The computer-selected human player is Ataru Moroboshi, a lecherous, unlucky and stupid high school student from the Japanese city of Tomobiki, and the Oni player is Princess Lum, daughter of the leader of the Invasion force.

While rescuing his wealthy boss's daughter from kidnappers, Sugata Kageoh, struck by an electric shock, was given the ability to merge with his shadow and transform into Kagestar!