The origin of manga artist Vincent!! Godfather ~Atsuko~ Misaki Honda Mao Hamasaki - Part 1 URE-015

Atsuko (Misaki Honda) is living a newlywed life with her husband, Hidehiko. However, her father-in-law, Sazo, hasn't spoken to them for three months, causing Atsuko anxiety. One day, Atsuko can't resist Sazo's lewd advances and has sex with him. However, her father-in-law reveals his true nature and begins his daily lewd pranks… Unaware of this, her younger sister, Nanako (Mao Hamasaki), is also drawn into the scheme…