The film is an incest affair between his brother and his beautiful sister Sugisaki. On the day their parents returned to their hometown to visit their grandparents, the two lewd brothers indulged in promiscuity and did what they had long desired. The younger sister constantly wears sexy clothes and makes provocative movements to be able to stimulate her brother's lust, helping the two to orgasm. And the brother also tried to satisfy her sister's craze by using sextoys or even having sex with each other.