Tomoko Kashima is a special agent of the Ministry of Galaxy Education. She snakes into Tsukishita Academy as deep cover operation to protect the Earth from the planet Bancho that plans to dominate the galaxy. One day， Noboru Iwashimura， a science division manager， is taken to discipline committee. Tomoko activates Sailor Unit to transform into Sailor Striker and dismisses discipline committee. However， she surrenders because Iwashimura is taken hostage. Tomoko has to fight with gigantic Bancho…