Soulnite ~The Soul Spirit Crystal~

Our story follows four girls who live in a village in the mountains.
To get to the bottom of a mysterious incident in the village,
the four must visit Mt. Puria with the old man who raised them, Linnel.
There they find the Soulnite, a gem that contains the collected souls of adepts of ages past.
Guided by the gem, the girls take these souls into their own bodies.
And then, before their very eyes, appeared the god of their world – Rinth.