An RPG where you have sex with the secretly perverted sister Aria and her huge breasts

A fantasy RPG set in a world conquered by the Demon King. The protagonist, tasked with defeating the tyrant, struggles against overwhelming odds until meeting a nun in a remote village. Together they discover that sexual acts increase their power level, and begin using this mechanism to grow stronger in their quest to restore the world. The game blends turn-based combat with intimate encounters as the core progression system.