Becoming the Foil to a Mary Sue Heroine

Xia Zhi transmigrates into a Mary Sue otome game set in an aristocratic school, becoming the foil to the kind, adorable, gentle heroine.

In the story, both she and the heroine are commoners at an aristocratic school, but their natures are as different as heaven and earth. She is hypocritical and greedy, always trying to cozy up to powerful people and even trampling on others' feelings without a second thought. A villain through and through, she naturally meets a terrible end...

She gets expelled early on and spends the rest of her mediocre life nursing a grudge. That's already the best ending in the game.

Xia Zhi: I'm tough, but not invincible, okay?

Fortunately, the story hasn't started yet, so it's not too late to change things. All she has to do as the foil is keep her head down and be a good student.

But reality doesn't always go as planned. After the plot deviates for the Nth time, Xia Zhi is completely confused.

Can someone tell her which playthrough this plot is from, or which route?

The romanceable NPCs recite their dialogue from different playthroughs, but reveal the dark personalities from their bad-ending routes. Then they all start clinging to her as if they're heading for a happy group ending...

Xia Zhi: Huh???

The heroine is standing right there. Why are you coming after me?

Theme: Happiness is earned through hard work!!