Sento Oumi

Оригінальне ім’я: 近江閃登

A young man who is the only human capable of seeing both Plug and Alesta. He works at a family restaurant and has a rather short temper, which results in frequently hitting Plug (and at times Alesta as well) with a baseball bat or whatever is within reach; this has become a running gag in the series. He lives with his younger sister. ( From Wikipedia)