Tokyo Train Girls 4: Young Wife's Desires

揺れる電車の中で　若妻の焦らされた秘肉

Also known as Yureru densha no naka de: Wakazuma no jirasareta hiniku

Akiko is the heiress of a lumber business family that spans many generations. She married Hiroshi, a company man, and was leading a plain and happy life. But dark clouds overcast Akiko’s happy life when Hiroshi starts an affair with Michiyo, an underclassman from the school Akiko attended. Then Shinji, who used to work in the family lumber business, enters her life the turmoil of men-women relationships becomes tempestuous.