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In the sweltering summer of 202X, a crisis looms over the demon realm. The souls that have long fueled their magic are drying up. Why? Because humanity has become more ruthless than the demons themselves, making the old contract of selling one's soul for demonic aid utterly obsolete. Faced with a devastating unemployment crisis, demons are forced to adapt, retraining as "Incubi"—creatures who can feed on life force without a contract. The protagonist, Ufir, embarks on this path, but the transition is anything but smooth. As he attempts a dangerous shortcut to become an Incubus, his plan is thwarted by a man who is as unyielding as he is righteous: the detective, Cheolho.

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Read manga First Love Reversal: The Detective Returns to Square One / Makoto Hyakutake, an unremarkable police officer who lived his first life as nothing more than a "background character," reaches the end of his life. In his fading, delirious consciousness, countless regrets come rushing in. The one he regrets most is the death of the woman he loved above all elseMisaki. They had parted on bad terms after a fight, and he was never able to save her. In the end, she was the only one he ever truly loved. If only he could live his life over again this time, he would protect Misaki no matter what. His wish is granted. Makoto is reborn as his past self from ten years earlier, back when he had just become a detective. Using the knowledge and foresight of what is to come, he throws himself into changing the futuredetermined that this time, he will save Misaki at all costs.