The Yandere Goddess's Darkening Conquest

A hero is someone guided by a goddess to defeat the Demon God wreaking havoc across the world and bring everlasting peace to it.

But Muen thinks something is very wrong with his job as a hero.

Demon God A: "The goddess asked me to pass you a message!"

Demon God B: "Heh heh! The goddess says you should stop struggling and let me finish you off!"

Demon God C: "With this sword bestowed on me by the goddess herself, I can take you out in just three moves!"

Why is the Goddess on the Demon Gods' side?!

Goddess: "Because once you die, Muen, we can be together forever!"