Karma known as the troublemaker and sadistic person are always like to caused trouble.But what would happened if his soulmate are An Angel?

In Class 3-E there's Angel and Demon which they have to work together in order to kill a monster called "Koro-Sensei". You got a mission to join the Class 3-E to end the monster. You are famous for killing any threat that deserve punishment and what would happened if you meet someone you don't like which is a Demon and not to mention your soulmate too?