Blank Dream is a freeware horror-exploration game by Kanawo (of Teriyaki Tomato) made in RPG Maker VX Ace.

Wishing that she had never even existed, Mishiro Usui threw herself into the lake.
When she came to, she was in the Mirror World, a place neither heaven nor hell.
There, her reflection instructed her: "Find the mirrors in this world, and break them."

WARNING: This game features many dark themes, with a particular focus on suicide.
It is recommended you not play this game if you feel the subject matter may be too much.