I'm Really Not a Grand Caster

[Note: The first two volumes are original stories. If you want to go straight to the Holy Grail War, you can skip to Volume Three.]

Sajyou Manaka, the Root Princess, transmigrates inexplicably into the Nasuverse, but something seems a little off about this timeline.

And then she...

Somehow becomes the Clock Tower's greatest genius,

Somehow becomes the youngest Grand Caster in history,

Somehow wins the Holy Grail War,

Somehow saves Human Order.

But Sajyou Manaka knows full well that, although she is a transmigrator, she hasn't gotten a System or any kind of golden finger.

The only thing she has is luck.

"I'll come clean. I'm really not a Grand Caster. I'm terrible at this, so why won't any of you believe me?"

Standing before the fallen Goetia, Sajyou Manaka said helplessly to everyone.