Mahou Tsukai no Deshi ga Warau Toki.

Ouka Namae is a boy who lacks of '"emotions." When he's hit or being scolded, he will not even lift an eyebrow. He cannot understand the feeling of being alive. the boy has to do something related to an "important person," which is the only method to obtain his "emotions"... This is the story of how Ouka Namae will obtain his "emotions."