You saw your family got killed while your hiding inside the closet. You want to scream or killed the murderers of your family but you remained inside the closet because that's what your mother told you to do so.... She wants you to live..... After an hours the murderers left..... With pure hatred you accidentally summon a DEMON and finally after 1000 years of waiting Sebastian got summon again and with a new master....."Ohh? Aren't you a very small master?"- The demon said