Chiyo Shinano is an OL in her thirties working for a small company. The castle has lived in a famous local city since childhood. One morning, a handsome guy in a suit that came out of a luxury car called out to me "Princess. I've come to pick you up." The man is Masao Koga. He was the head of a global company that acquired Chiyo's company. Koga, who takes her hand as "I am your loyal vassal," buys a castle in the town (price is 300 million) and tries to make Chiyo live there. Around her who became "Shinano's Chiyohime", a person with a habit begins to gather, and soon the secrets related to "Castle" and "Princess" are revealed. Who are Chiyo's feelings going toward while the thoughts of men and women are intertwined?