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Haruka, an employee at a real estate company, is lamenting over her work mistakes and her unrequited love for a senpai who recently got married when a meteor suddenly strikes her window. The suspicious man who fell from the sky claims to be the self-proclaimed Demon King! He then informs her that in her previous life, she was the saint, making him her archenemy... as if anyone would believe something straight out of a light novel!
He then declares, "I'll make you happy, and when you've regained hope, I'll plunge you into despair!"
A corporate slave who was once a saint in her past life, now shares a life with the Demon King, who gradually becomes a doting lover. Their story unfolds as they navigate this unusual cohabitation.
