The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised.
Humans keep monsters as slaves for fighting and protection, but there is one, Zai who refuses to fight. Zai is special since he can use magic by creating spells with his songs, but he refuses to sing too... will he, for his master? -has sequel, "Ichido Dake no Uta"
