Introducing Yayoi, the healing idol-type little sister! With her lovely, bright smile, she captivates hearts. Her petite A-cup flat chest and slender, graceful figure are her trademarks. Her soft yet firm, shapely buttocks are a highlight, and her sensitive body strongly reflects her feelings toward her older brother. On a night when their parents are away, the siblings are left alone together. The brother, who has long restrained himself, can no longer suppress his desires, and they gradually unravel through his time with Yayoi. Their intimate relationship develops naturally, drawing their hearts closer than ever.