Ai Sugawa, a 16-year-old girl, harbors a long-standing love for Naoya Senpai, a revered star of the Track and Field club and a popular figure in school. Just as she musters the courage to confess her feelings to him, a demon named Aya the Beast arrives, declaring, 'It's been 11 years, Ai.' With ominous dark wings unfurled, Ai is left stunned and bewildered. What twists await in this unexpected encounter?