Kyonyuu Kazoku Saimin "Kazoku Nan Dakara, Sex Suru no wa Atarimae yo ne......"

After failing his entrance exams, Yuuichi attends prep school while his rarely-home father remarries, bringing three new women into the household: the mature and alluring mother Mifuyu, her gyaru eldest daughter Natsuki, and the reserved second daughter Akiha. Living with them fuels Yuuichi's uncontrollable libido amidst exam stress. Then a mysterious package arrives—a penlight that can hypnotize anyone, but only to act on desires they already harbor. Starting with commands to 'get along as a family,' Yuuichi escalates to making them bear his child, forging a 'real' family. Soon, the trio of mother and daughters, driven by their own carnal cravings, seek ever more pleasure.