Following their intimate dream rendezvous, the hero persists in his amorous advances back in reality, much to Sakkyun's surprise. A beautiful black-haired girl emerges and swiftly takes the startled succubus's companion away. Revealing her true nature as the demon lord, she engages the hero in a series of encounters that push his invincible skills to their limits. What will become of him after facing such a formidable opponent?