To Set My Party Members Straight, I, the Hero, Chose to Pretend to Fall to Darkness

(A corruption-to-purity story with one heroine and multiple love interests. The protagonist can't stand her teammates' malicious treatment of her, so she pretends to turn evil.)

"Whatever. Why bother with her? As long as the hero can handle the Demon King, that's all that matters."

"Exactly. Before facing such a great enemy as the Demon King, we don't have time or energy to worry about her personal feelings."

"Tch, you two say all that, but you just can't be bothered with her. Still, that's fair. She can beat the Demon King easily anyway. We'd better start figuring out what to do with that enormous Demon King's castle! If I take it back, I can become a noble!"

The other members of the hero's party were utterly confident about winning this campaign against the Demon King. Not one of them paid any attention to the rather strange sight of the hero standing with her back to them.

"Ha! You were just a little too late. Your hero belongs to me now!"

At the Demon King's sudden boast, the three noticed an ominous crimson aura rising from the hero. Her hair began to turn white, and the holy light surrounding her started to fade.

She rose once more, looking sidelong at them with nothing but numbness in her eyes. She raised her holy sword against her former teammates, her steps exactly the same as when she had once slain her enemies.

"Hey! Stop! The Empire has treated you well! I command you to put down your sword!"

The Empire's princess retreated slightly, her face trembling beneath her golden hair.

"Hero! You're going against the will of the gods! Please stop!"

The Church's saint clasped her hands in prayer before the godless hero.

"Hey! Ai Luo! What do you think you're doing? Aren't you afraid the Empire will punish you?"

Faced with her former classmate from Earth, the hero gave no answer. She simply swung her sword.