If Everything Starts over Shadow

The demons began to attack all major races. People in this world no longer have the power to compete with them. So, the world needs heroes, so I was summoned. Even gods are just like insects in my eyes, let alone a mere demon king. But the ending is not happy. In fact, the real enemy is not the devil at all. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.