Cheating in Another World!
The Hero Stole My Girlfriend!
So I'll Help the Demon Lord Destroy the World

I was transported to another world – and the Hero immediately stole my girlfriend!

Kenta and his girlfriend, Kaori, were transported to another world. They join the Hero’s Party on their quest to vanquish the Demon Lord. Everything seems to be set for an easy life, traveling across a fantasy world, fighting demons – until Kenta finds out that Kaori has begun sneaking off with the Hero.

That is when he decides to side with the Demon Lord. If the Hero stole the girlfriend, then he will help the Demon Lord destroy the world! Except there is one problem: the Hero is invincible.

He and the Demon Lord form a pact; Kenta will help the Demon Lord find the Hero’s weakness so that they can destroy him.

Kenta travels with the Hero’s Party, knowing that every night, Kaori is visiting his tent. Will he find the Hero’s weakness? Or will his spirit shatter first?