I am Kyōichi Hatano, 34 years old. I've been married to my wife, Yui, who is the same age as me, for seven years now, but honestly, sex with her... isn't satisfying enough. One day, while I was feeling this vague frustration, I spotted a nice young guy named Hashimoto coming out of our house from the floor above us. A few days later perhaps... my wife suddenly became more erotic.
