Minami's second son, Satoshi, his father, Isao, selects Harumi, who graduated from a national university as a subordinate of the company, as a tutor. However, contrary to his father's wishes, Satoshi only cares about Harumi's chest and is unable to study. Harumi stays overnight to study with Satoshi for the upcoming regular exam, but... Late at night, Harumi, who can rest her tired body on the bed, is played with her plump body by her father. Satoshi's older brother, Shinji, peeked at the situation, and even before the exam, Satoshi told him the truth...
