Walpurgis: Enkan no Meikyuu

It is in the depths of a comatose labyrinth--.

......Sayaka-chan, Sayaka-chan......
I thought I heard someone calling me. Consciousness slowly rises from the depths of sleep, and Sayaka Miki's thoughts are lit.
The voice belonged to a very important and treasured friend.

Résumé

This game is an exploration-type action game in which the player controls Sayaka Miki to explore a labyrinth.
The player controls Sayaka Miki, who has lost her memory, and explores a labyrinth filled with mystery.