His father remarried and his new mother was only four years older than Hajime. Hajime was living a new life with his young mother-in-law, Saki, and was always lustful for her beautiful, big breasts and youthful body. Hajime, who attends the university's pharmacy faculty, mixes the drug he obtained and secretly administers it to Saki as an aphrodisiac. A few days passed and changes appeared in Saki's body... I was desperate for my young mother-in-law's body...I devoured Saki, who had turned into a wild slut with an aphrodisiac, every day.