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—!?