/jp/ - Otaku Culture

I've been catching up with the story and this is honestly pretty shameless
So let me get this straight, Dark Youmu is

A mysterious, traumatized character in black clothing. She lived a peaceful life until she came across a foe who she just could not beat and her special one fell victim to it. She went back in time and tried various strategies to save the girl she loved so much. She tried convincing her to stop, but she did it anyway, she tried convincing others to help, but they just turned hostile so she decided she didn't need anyone anymore and would shoulder the burden herself, she eventually took drastic measures and became ruthless, but even that was still not enough. Trapped in this time loop of her own creation, she spiraled out of control, failing each and every time to save the one she held dear.

Now where have I heard that one before...