My System Has No Name

My System doesn't have a name...

Half a year ago, I met a petite girl named Xiaoya, so tiny she couldn't possibly be any smaller. She might be related to a certain medicine-loving old man, since the place she dwells in is also a ring... And she gave me an unknown System = =

How depressing... But this has also given me the power to protect the people around me!

I'm Kaguya! I have absolutely nothing to do with that NEET princess!