What's Going on in This World?

Signed a contract with an unknown god from another world, traveled through time and became an apostle of the secret sect, and lived in this world for the rest of his life. This was the result. Leaving this place with no nostalgia, abandoning the past, and starting an adventure written by me is my wish and the cause of everything. "Oh! I found it, a suitable person!" "... Who are you?" "For some reasons, I will sign a contract with you. You can take a closer look! Although you will not be able to return to this world for the rest of your life." "I promise you."