The Secret Devil-Chan Vol. 1
Alt. Title: ひみつの悪魔ちゃん / himitsu no akuma chan
Desperate to lose his virginity, Sou summons a devil named Kogure from the underworld to help with the deed. However, when he discovers that Kogure is a boy, he flees. Thinking the ordeal is over, Sou returns home only to find Kogure has insinuates himself into Sou’s life, and that he’s determined to stay until their deal is complete.
Desperate to figure out a way to nullify the agreement, Sou finds himself blocked by the devil at every turn. This stubborn Incubus is willing to do whatever it takes to win him over. But how will Sou handle a devil in his life?