Due to her husband's mistake causing a 20 million yen loss to a client company, the chairman proposes that Ayumi Natsukawa work as his secretary three days a week. Fearing her husband's company will go bankrupt if she refuses his terms, she accepts the offer to protect her family and livelihood. However, once she begins working as his secretary, unexpected circumstances unfold. Her relationship with the chairman gradually deepens, drawing her into compromising situations. Her marriage starts to deteriorate as the balance between home and work collapses. Soon, the true challenge she must face comes to light.