Mahou Kishi R**earth - Yami ni Ochita Hikari

Hikaru, Umi and Fuu (3 heroines) have been summoned by Cephiro to a parallel world, to journey to the Spring of Alterna.

On the way to the Spring, they strayed into the Silent Forest. Lost and vulnerable, the girls are tricked by Zagato's minion, and play directly into his devious hands!!

[From DLsite English]