A 10,970 yen limited edition will also be available, which includes an acrylic plate and microfiber cloth.

Ever Maiden: Daraku no Sono no Otome-tachi first launched for PC on February 25 in Japan.

Here is the story synposis, via VNDB:

This story is about “Puellarium,” a school isolated from the outside world by fog and thorns. Here strict discipline is always in effect, where the air always tense and time never disturbed. However, one morning a girl was found unconscious in front of the school gate. This gate is always closed and should only open on special occasions. The guards, on alert, asked her to name herself to which she replied “Alouette.”

At that moment, the bell of the clock tower, which was rusty and always silent, rang out. “When the bell of the clock tower rings, the end of this school will come soon.” Like the gossip had hinted, it was the beginning of a nightmarish turmoil in Puellarium. Alouette who had became a student after many complications, violated curfew and left her room. What she saw there was a school that had turned into a different world, and a strange shape that wandered around with a murderous intent. With determination she called out to the girl in front.