Can't Find Skin

I play on the Japan server for the fast internet. I opened a chest and got a skin I didn't recognize. I accidentally pressed the button to rent the skin and I wanted to see who it was for (I can't read Japanese). I searched all the skins in the store and online several times looking for the skin I unlocked. It looks overall dark with a little purple, a girl with shortish black hair (maybe some white? i don't remember). I thought it could be Fiora or Evelynn but didn't find it. Any ideas?