Maimu (舞夢)

Overview
Maimu (舞夢, Dance Dream, stylized as my mu), is a Japanese fangame made in WOLF RPG Editor by Kei Amamori, who also made Physicality (フィジカリティ). It stars Kiratsuki.

Gameplay
Kiratsuki sleeps in a makeshift bed in what looks like an old stone temple to dream. She refuses to leave and saves via a music box.