In the castle, the poor boy, Bisk Chris, is trying to steal medicinal grass, which can extend the life of the coupons, which live only 25 years. Bisk saves a tall and handsome man, completely covered with a long overcoat. After a long period of teaching a sword, Biski returns to the castle to become a knight and protect a person who originally saved it. Bisku believed that a woman was a woman, and wanted to sacrifice his life for her. However, his Savior was * King * Kastral, a scientist who is 700 years old. (The scientist signed a contract with the people of Gyokuto, which possess magical abilities to cure any disease. In exchange for her blood, Erudor received eternal life and terrible blue blood, which the herb produces). Biskyu has a chance to become a subsidiary of a scientist's knight, but instead again falls in love with a scientist. Bisk