Which is Devil?

Synopsis

From Shogakukan: Liz, a devil apprentice, comes to the human world where his final examination to become a full-fledged devil takes place. The content of the examination is to make Kanato, a boy, unhappy within seven days. Being affectionate by nature, Liz fails no matter what she tries. Besides the title story, five debut works of Naho Maita are collected.