Raziel has awakened from an 820-year slumber. He holds the noble title of Asil, which means protector of all other nobles and pure-blooded aristocrat. In an effort to protect him, his servant Frankenstein enrolls Raizel in Ye-Ran High School, where he will learn about the everyday and ordinary customs of humans through his classmates. However, the Union, a powerful secret organization with the aim of ruling the world, increasingly harms Raizel by sending altered humans, which leads him to harness his mighty power to protect those around him. After 820 years of intrigue, the secrets behind Raizel's slumber are finally revealed, and his absolute guardianship as a noble begins.
