Asagi Igawa is an experienced demon slayer. After defeating her arch-rival, Oboro, she decides she can leave her dangerous job and settle her personal life. But no such luck, Oboro comes back to life thanks to a pact she made with the demon leader, with only one goal: revenge on Asagi. Oboro captures the girl herself, as well as her boyfriend and sister (also a demon hunter), then subjects her to humiliation emotionally and... sexual