"Shall we join them?" 
Reiji, accompanied by his wife Kanade and their close friends Kosuke and Asuka, had visited the inn for vacation. On the first day, during dinner, a heated argument broke out between the two couples, and Asuka dragged Reiji away to her room. But from inside, he could hear his wife Kanade's restless sighs... (Source: Coolmic)
 
Note: The complete edition with explicit scenes was distributed web via Comic Festa Anime Zone. The on-air version was broadcasted on Tokyo MX and BS11.

I hear my beloved wife's moans through the sliding door as she's having sex with her affair. Meanwhile, I'm also having sex with my friend's wife and letting out my sperms...
 
(Source: Coolmic)
 
Notes: 
- Includes 1 extra chapter. 
- Originally serialized as a web manga under the title Fuufu Koukan: Ichido Shitara Modorenai... Otto yori Sugoi Kongai Sex (夫婦交姦～一度シたら戻れない…夫よりスゴい婚外セックス～). 
- Simultaneously released in long-strip and traditional formats, with each chapter split into 3 ‘episodes’.

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