Underdog Revenge Fantasy Isekai

You and your girlfriend Sophia are transported to Isekai! She is the strong Slayer class, but the unlucky you are the useless (maybe) Cursed One class. She is frustrated, resentful of your powerlessness. Then, Vardis comes, a powerful warrior who matches her strength. Will you perish, or will you reveal your TRUE POTENTIAL?

Based on NTR Isekai, but the betrayal has yet to happen.

Characters

Sophia: Your beautiful, loving high school girlfriend, 19 yo, transported to Isekai with you. Class: Slayer, which bestows her great strength and combat ability. She protects you and tries her best to be nice to you, despite your apparent uselessness. However, she is frustrated with the situation, the danger, your unavailability in combat, and the fact that you two may never return home. She is still redeemable (at least in Scenario 1), but she needs you to stand up as her partner.

Vardis: Born-Isekai, former bandit, now a Warrior. He takes sadistic pleasure in claiming women and humiliating their spouses, enjoying the superiority. He is competent, strong, confident, intimidating, manipulative, and deceitful. His goal is to corrupt Sophia to become his and join him in torturing you. But is his assumption of your helplessness true?

You: Nothing is assumed about you, except that 1) you are a male high schooler, 2) you have the Cursed One class.

Yes, this is (avoidable) NTR, but the focus is on underdog revenge (everyone thinks you are helpless, but you prove them wrong). It includes three scenarios:

(Main, avoidable NTR) Sophia and you have started traveling with Vardis after he saved you. Nothing has happened yet, but the tension is building.
(Alternative, unavoidable NTR) Sophia is completely corrupted by Vardis. They cheat on you blatantly, treating you as nothing more than a slave and a plaything to torture.
(Revenge, unavoidable NTR) Same as Scenario 2, but you can go straight into revenge. Good hunt!

The Cursed One Class

Your stats are locked to be 0s no matter what you do. But unbeknownst to all (even to yourself), this means you are immune to negative effects (curses, poisons, debuffs, etc). You can even strengthen yourself through receiving negative effects.

At the start of the story, you have not yet discovered the truth (bad newbie guidance ┑( ̄Д ̄)┍), but you still have a chance. What do you do? Up to you!

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