Shoujo Tantei Rinn-chan no Jikenbo - Dennou Shoujo Densetsu

In a medieval fantasy world, Sister Norico acquires a cursed item and transforms into an evil witch. To save her, the young detective Rin-chan learns ancient sexual secrets from a mysterious Chinese figure and obtains the Fox Sword from a Central European alchemist. She then bravely ventures into Norico's demonic dungeon. This RPG features a female protagonist, dungeon crawling, and high sexual content including themes of game over and rape.