Volume 1 
1-4. Happening 
7-8. Haitokuzuma (Immoral Wife: Secret Past) 
9. Girl Under the Rain Volume 2 
5-6. Netorare Zuma Anna (Netorare Wife Anna)

Natsumi lives the life of a happy housewife. She however lived on the edge in the past meeting many people and therefore experienced a dark chapter in her life. She has worked hard to forget her dark past but her mind and body will not allow her to do so completely. She has done a good job of controlling herself until one day her husband brought a friend over to the house and that particular friend happened to be someone that she had a fling with during her wilder, darker days. The lust that was caged for so long has now broken free... 
(Source: Japananime.com)

Reiko is sexually frustrated because her husband is obsessed with an idol that looks like her and only says the idols name during sex. Reiko tells Hiroaki's friend Taniguchi about this and offers to become sex friends to release all her pent up frustrations. 

Tags