You play as the hot holy priestess on a mission to free the 6 cursed souls that reside in an ancient mansion. While exploring you encounter them, 4 of them are futas, and three of them immediately gangbang you. This game has multiple endings. The ending is determined by rank. The hentai is awarded for certain scenes: you finish a ghost's objective, she fucks you then leaves. You get caught (like in that initial gangbang scene) there's you guessed it: hentai. Enjoy!