Carissa, the most popular nun at St. Esther’s Cathedral, had a dream one night about a witch being abused by the Knights Templar and woke up to find the whole church in a strange atmosphere.

First, she was robbed of her chastity by a tentacle monster that looks like an octopus; her best friend Betsy, who grew up in the orphanage together and took care of her like a dear sister, began to speak coldly and inexplicably; Even Father Benson, the most revered in the church, killed the bishop because of his madness...

The St. Esther’s Cathedral was cursed by a demon that returned from hell and will come to an end in five days. Through the friendship exchange between Betsy and Carissa, the player helps Carissa to get a happy ending in this life and unveils the mystery of the past.

[From Steam]