The main protagonist, Beelzebub is the son of Lucifer and thus the "Prince of the Underworld", he is usually referred to only as "Prince" by his fellow demons. Beelzebub (named after the biblical demon of the same name) lives in relative harmony with the humans. Although he regularly steals water from them, he only takes as much as he and his fellow demons need to survive. Joining Sheriff Rao in his journey to give him something to do, Beelzebub lends his enhanced sight and demonic strength to fight against the king.