Sol/Rui: Magical Girl of Another World

It was a day like any other. - Rui was in class one moment, then the next thing she knew she was collapsed in a cave. - She fled for her life from a monster that came at her, and met a magical girl named "Sol". - Sol explained a crisis that threatened both of their worlds. - In order to fix the worlds, Rui needed to collect magic stones. - What can an ordinary girl expect to do in a world of monsters, battling all by herself---!?​