Kazuki, Mayu's husband, held a key investment role at a foreign fund. His colleague and close friend, Oki, was also a fierce rival. One day, Kazuki suffers massive losses, putting his career in jeopardy. At that moment, Oki proposes a game: seduce Kazuki's wife, Mayu. The terms are simple—accept the challenge and risk losing her, or refuse and forfeit a crucial business deal to Oki. Kazuki firmly believes in Mayu's loyalty, but Oki skillfully exploits that trust, gradually destabilizing Mayu's emotions until he ultimately claims her. This story delivers a dramatic clash between financial rivalry, love, and desire. Deep portrayals of Kazuki's crumbling confidence and Mayu's conflicted heart create a compelling, emotionally charged narrative.