Guided by a manipulative Goddess, Milia ventures into the Succubus Tower to retrieve what she believes is a sacred treasure, only to fall into a trap set by the Demon King. After winning a perverse competition against a succubus, Milia obtains an item that secretly drains her power. As she attempts to travel to her next destination, she continues to succumb to the Goddess's influence, accepting humiliating sexual demands as part of her duty as a hero.