When Sakusa Kiyoomi, the demon prince of Hell, attempts to travel to Earth, a teleportation error lands him unconscious in the backyard of Miya Atsumu. Unaware of Sakusa's true identity, Atsumu takes him in, nursing him back to health. As the two grow closer, their connection deepens into something far more powerful than either expected. But when Sakusa's demonic past threatens their future, he must make a choice-return to his kingdom or forsake his crown and live as a human alongside Atsumu. Can love conquer the flames of fate, or will their worlds tear them apart?