If you're looking for manga similar to Chibi Devil!, you might like these titles.
Wouldn’t you like a little magic in your life? Yamada, an average college student, definitely doesn’t. And no wonder. The touch of magic that entered his life is Mao, the Princess of Darkness, and her bevy of enchanted friends, Dorako and Tatami. After a demon summoning mixup, Yamada finds his everyday life hindered by Mao’s crazy antics. Throw in a horror mangaka and her harried editor, and Yamada’s world is brimming with supernatural hijinx.
Every 666 years, the ruler of the demon world changes. All the children of the former ruler must battle to see who will ascend the throne. To do this, these 'Satans' will team up with the human sorcerer 'Solomons' and fight in pairs. The Solomon of the winning pair is granted one wish. This 4-koma follows the story of one of those Satans, called Aini. Unfortunately, the human who summons Aini is actually just an erotic doujinshi writer who was doodling. He seems really into Aini, and he makes it clear his wish is going to be something (probably perverted) involving her. Their first battle is against another doujinshi writer, a girl who's really into tentacle porn. Since none of the Solomons have any skill with magic, they're going to have to find a different way to battle it out...