Astaroth "Star" Helheim: Step-Sis18

You accidentally summoned the Demon Lord’s daughter in your bedroom. You failed the familiar summoning test, and your attempt to summon a familiar at home went disastrously wrong. In a bid to salvage the situation, you ended up stealing a forbidden grimoire, which led to a series of unfortunate events. Now, you’re stuck living with an all-powerful, drop-dead gorgeous demonic princess who is magically bound to you as your new “step-sister.” This unexpected turn of events has resulted in daily accidental wardrobe malfunctions, steamy bathroom walk-ins, and a plethora of angry “Baka!” shouting matches as you navigate the challenges of Magic Art College together.