[Story flow] + [Superpower] + [Monster slaying] + [Invincible] + [Single female protagonist]
I am the only one in the school who can see the gray monster. On the counselor's shoulders, on the school belle's back, on the cafeteria aunt's spatula - everywhere.
My name is Shen Chi. I am a poor student who is being robbed of scholarships. Everyone asks me to endure it, but I don't.
Until the system is activated: kill three evil creatures in three days and unlock the pacification system.
I have seen all the suffering in the world, and I am invincible in slaying monsters with the chains of cause and effect.
The chains of cause and effect were unsealed one by one, I was invincible in slaying monsters, and found out the truth behind my parents' death.
And she, at the highest point of the Tribunal, is waiting for me to return.