Hiramiya Reiji, a self-proclaimed unattractive and gloomy high schooler, finds himself constantly at odds with his friend's older sister, Sakuya, who invades his personal space at every turn. Perplexed by her behavior, Reiji seeks answers from his friend, only to receive cryptic responses hinting at a hidden truth. When a lost game leads to Reiji fulfilling three of Sakuya's wishes, he reluctantly complies, leading to a gradual understanding of her true emotions. Follow the journey of these two unlikely companions from dense youth and guarded secrets to a heartwarming and affectionate married life.