Project I and You (The Bond of Darkness and Lightness)

The story starts with our MC, Aki who dies at earth with a worse tragedy. He finds himself in complete darkness and hears a voice of an entity. The entity is God of Darkness who has summoned Aki for his mission. And Aki's mission is to become the complete vessel of God of Darkness so that God of Darkness can start on his secret mission. Aki got ready and with 5 magical powers, he started his journey at a new world with a new beginning.