If I could just return to that day, I would do anything. After attempting a double suicide with her first love, Yui, at the age of seventeen, Kayoko is the only one who survives and returns to her hometown, which she had been avoiding. However, after eleven years, Yui suddenly appears in the form of her seventeen-year-old self. Why after eleven years? And why does she still look like a girl? A seventeen-year-old unhappy girl and a twenty-eight-year-old who seriously cares for her. A sentimental yuri novel where long-held feelings change the "world."