A plain and quiet college student, Kazuka, with a bust size of 100cm. Her younger sister Satori secretly harbored romantic feelings for her best friend Hikaru. One night, Hikaru decided to have a study session and, while Satori was asleep, he groped Kazuka's massive breasts and made her climax with cunnilingus and manual stimulation. Delighted that he had united with the object of his affection, Kazuka, Hikaru continued to actively pursue her body, unaware that they were in a love triangle...
