Origami Ouka is the head of the Origami family, a clan of demons. Alongside her studies, she diligently works in the family business of exorcising the supernatural beings known as "Yodoma" that plague the world. The protagonist, Ouka's childhood friend and now her husband, also has an important role to play in helping with the Yodoma extermination. That role is... to have a child with Ouka. "You're tainted, brother (※not related by blood)... but it's fine, I suppose." Her large, firm breasts, fully developed. Her graceful gestures, accepting him with a touch of shyness. The woman he'd known since childhood is no longer a virgin; she's a young wife who directs her love solely towards him. ...Something's wrong. Was their relationship really like this? The doubts that cross his mind also melt away with pleasure... The demon princess priestess has two roles. ① To exorcise the demons born from negative human emotions and protect the peace of the human world. ② To produce an excellent heir as the head of the demon clan. → [Making babies] ♡?