Uchi No Maou Kamimasen Yo

in a world where people have supernatural creatures as pets, a certain family has a pet demon-lord satan. the main carer of satan is the son, yuuhei. from initially coaxing the new satan out of his pet-carrier, to walking him, playing with his ball, and keeping him from fighting with the neighbor's pet hero, this is the comedic story of a boy and his satan.