Element Embrace

Into the dreams of a young girl comes a goddess.
She grants the girl a sword of heroes, and tells her to work with a shrine maiden and defeat "that which is evil," before leaving...

"Yeah, right, like that'll happen!"

In the administered society in which she lives, one cannot fully exercise a weapon's power unless with the King's protection.
Thus, she brings the sword she was given to the Castle to turn in as a lost-and-found item.

- World
An orthodox fantasy RPG set in Flandris, a world that was said to be created by the Goddess Flandre.
RPG and adult elements are quite clearly distinguished, but if you let your guard down in the story, who knows what would happen...

- Costume Change System
Players can change the four girls' hairstyles and outfits at will.
Hairstyle and outfit changes will all be reflected in the sex scenes, portraits, as well as pixel art, resulting in over 130 combinations.

- Unique Hack-and-Slash Elements
Using items obtained in battle, players may enhance any character of choice in their stats.
Players may choose to enhance magic-specialized characters with physical stats, or focus all their efforts on one character alone.
At the end of dungeons, there are treasure chests containing powerful weapons with special abilities, as well as catalogs of ideas required for hairstyle changes.
(Outfits are hidden all over the place outside of dungeons.)

- Erotic Elements
Prostitution = defeated in battle and get humiliated > r*ped > consensual sex
Game can be cleared with everyone still a virgin, but all sex scenes have been fully voiced by seiyuu, so they are worth a watch and a listen!