"I'll grant your wish, in exchange for your pleasure." Kidnapped by a ruthless demon king and taught to feel hot and sweet sensations... Caught up in a ceremony to summon a saintess, Mitsuha came to a different world. Compared to her sister, who is a powerful saintess, Mitsuha who was considered an "extra", is locked up in a prison cell. As she wished to return to her original world with her sister...the one who came to her rescue was the demon king...? "I want your power, I want your essence..." His long fingers and tongue stirred her up into a mess... She should be scared, but can't resist the pleasure he is giving her...