The OP Extra Will Change Your Life

I became the half-sister of an overpowered (OP) female protagonist.
More precisely, I’m just one of her 39 siblings. The only setting I was given: “a neglected imperial princess of the palace.”
So I’ve been living accordingly—mistreated in the imperial palace… but something’s off about the extra I possessed. “Wait… I have ridiculously overpowered magic?!” With great power comes responsibility.
Somehow, I ended up using my power recklessly to help others. I saved a young dragon trapped in an underground prison, helped a fallen noble turned s*ave start a revolution, and stopped a genius magic-stone planner from being forced into a political marriage. After living as this OP extra for six years… I ended up planting my own death flags as the price for overusing my magic.
As I try to overturn the imperial palace to survive, the people I once saved start showing up, saying they’ll save me.