Noboru, constantly scolded by his father over his grades, had come to rely on his stepmother, Shuri, as his emotional support. To him, Shuri was an object of deep admiration, someone he secretly watched from the shadows. But one day, Noboru accidentally witnesses Shuri meeting a strange man in secret. He sees them kissing passionately, their tongues entwining, a sight that shocks him deeply. What he feels isn't just disgust—it's something else, a powerful and unfamiliar emotion. That night, haunted by the scene, Noboru finds himself drawn to Shuri, seeking her lips, craving a kiss, his tongue reaching for hers. What unfolds is a turbulent mix of jealousy, anger, and complex desire, shaking Noboru to his core.