Ura no gokesan: Vibe ni muchû

裏の後家さん　張形に夢中！

Also known as 裏の後家さん 張〈バイブ〉形に夢中,, 裏の後家さん 張形（バイブ）に夢中, 裏の後家さん　張形〈バイブ〉に夢中！, イケない未亡人　淫具の虜, 後家さんの秘密　私、この色艶が好き！

35-year-old Rie has been working hard cleaning parks since her husband, who ran a toy company, passed away. However, she was raised as a rich girl and is naive, so she makes mistakes at work. On top of that, the company president comes on to her after she makes a mistake at work, and Rie's chastity is hanging by a thread...