凛とした最愛妻は、人知れず淫乱ら妻へと堕ちて ～他の男を受け挿れ拡げられた濡れ穴は、もう俺のモノでは埋められない～

Hirokazu and Madoka, who met in the same seminar at university, were leading a peaceful life as a dual-earner couple.
The only complaint is that his wife earns more money than him, and that their nightly activities are a little too boring.

But recently, there was something that bothered him. A chance encounter with Shogo Makino, the man who used to be interested in Madoka. This brings back memories that he had been trying to avoid remembering.