In her fourth year of marriage, An (30) lives with her husband, an ordinary salaryman, and they've never had any major issues—enjoying what seemed like a happy married life. Yet, ever since before marriage, she had been an ardent fan of a particular idol group that deeply captivated her heart. Attending live concerts, buying merchandise obsessively, and visiting drama filming locations had become part of her daily routine. Driven by her desire to support the idol's activities, An visited Tachikawa. Unsurprisingly, Tachikawa demanded sex in return. Oblivious at first, An reluctantly followed him into the bedroom—and right there, it began.