Adult PC Game: Lune - The Passion of Marguerite, a female warrior with big brown breasts!? Final Archive

Overview:
The protagonist attends adventure school as a pharmacist along side his childhood friend, Marguerite, who attends as a warrior. During a training mission to retrieve a treasure from a ruin, Marguerite set off a trap that ended up with her and the protagonist getting cursed. Along the way, they both must do trials — from acting like a couple, to sexual acts. Will they break the curse?​

Lune - The Passion of Marguerite, a female warrior with big brown breasts!? Final Gameplay Preview