Set in the second half of the 19th century, in the Victorian era of England, the protagonist is Sebastian, the butler of the aristocratic Fadom Hain family. He combines knowledge, education, taste, cooking, martial arts... and other eighteen weapons into one body. It can be said that he is a butler who cannot find faults. The master he serves is a willful 12-year-old young master Charles. Today, Sebastian is also wearing a dark tuxedo and performing his mission gorgeously...