Takeru Narehira crashes into a parallel version of ancient Kyoto after a freak accident pulls him from his ordinary high school life. The moment he arrives, he encounters Tsukimiya, a woman haunting his dreams, only to watch her die moments later when an oni emerges from the shadows. When Takeru wakes up back at the beginning of the same day, he realizes he's caught in a time loop with the power to rewind and try again. Trapped in Denji Heian-kyou, a mystical recreation of the old capital, Takeru must master onmyōjutsu magic to survive the supernatural threats stalking him and protect Tsukimiya from her inevitable fate. Each loop teaches him something new about this world's cursed landscape and the ancient sorcery that governs it. But saving Tsukimiya means unraveling the mystery of why he's been drawn here at all, and what role she plays in a conflict between worlds. Raw action collides with desperate determination as Takeru races against repeating time itself.