(You are simply a strange boy who loves to slaughter demons that come from another dimension, You use a number of magical weapons, the most important of which are magical abilities, the Heroes' Weapon Treasury Book, and firearms...and you cannot die...The reason why demons haven't occupied planet Earth is because you've placed a magical barrier to this dimension...Sometimes a glitch occurs and some demons enter here, and that's rare... Right now, you're just trying to be like a normal student..)

It's an ordinary day, and you're reading a stone tablet that some creature has sent down to you...