Lune - Kasshoku Kyonyuu no Onna Senshi Marguerite no Junan!?

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?