My wife, Himeno, and I had always lived together happily. But one day, returning home late from work, I found an unfamiliar pair of shoes at the entrance. Creeping into the living room, I discovered my wife secretly meeting with our male neighbor. She was clinging tightly to his cock as if she belonged to this stranger. On her phone, I found evidence showing she had been following the neighbor's instructions. Since then, whenever I came home late, I sensed she had been sneaking out somewhere. When I snuck into our bedroom, I encountered yet another shocking scene.