The Dirty Way to Destroy the Goddess's Heroes, Vol. 1 (light novel)

Fed up with cocky heroesalways looking to save the day when all he wants is to find delicious treats forhis cute daughter, the blue demon king of the underworld calls upon a youngboy--Sotoyama Shinichi--for assistance. Once the two make a deal, the kingresumes his visit to the human world until he realizes he may have chosen thewrong person for the job...