The "King" of a certain kingdom called for the veteran hero "Shekanea" in search of the romance of "a king and a hero who will save the chaotic world." However, the hero who appeared had aged well after 40 years. On the same day, "Zuk", the owner of the fish shop "Uoyasu" who purchased a super-sized sea bream, visits the castle to sell the sea bream to a party that welcomes heroes. However, a soldier in the castle misunderstands "Sakanaya" and "Sekanea" and is forced to be dragged in front of the king.

One side is a shabby old man, and the other side is a town fishmonger. In order to realize his romance, he summons a brave man and at the same time blows up the Great Demon King's seal, the king finds himself in a predicament.