After the worst night of her life, 32-year-old office worker Hiroko wakes up to find a terrifyingly intimidating client executive sleeping naked beside her—and a mysterious engagement ring on her finger. Exhausted from enduring workplace harassment and unfair treatment, she had hoped to finally marry her longtime boyfriend, only to discover his affair. Following a night of drowning her sorrows in alcohol, her life takes a dramatic turn. What follows is a nonstop Cinderella-style romantic comedy between a desperate office lady and a talented president with hidden circumstances.