Suddenly, Yuuko’s younger brother contacted her saying, "I bought a detached house with my boyfriend." However, the person in question hid somewhere on the day of the move. Yuuko, an office lady who decides to pay a loan instead of her younger brother, decides to temporarily live with her younger brother's partner, Odaka, with the intention of waiting for her younger brother for a while. In a newly built house, her brother's boyfriend's love home, the living together of a girl who is not good at housework and a man who is careful has begun!

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 is Chiyo's feelings going toward while the thoughts of men and women are intertwined?

"Iron Lady", Sawatari Yoriko, is a tireless hard worker with a strong planning ability who has lived her whole life completing goals she's set out. Just when she thought she was about to reach her goal of marriage, she was suddenly dumped by her lover of 3 years and told, "You don't suit marriage". Feeling heartbroken, Yoriko decided to prove that she is "someone who can get married" and began to chart out a "marriage plan". Though she's set out on her plan and started her marriage hunting activities, she's only been met with failures... In the midst of that, that's when she met Yuuki Keishi, a light-hearted and hard to grasp esthetician. This is the start of a love battle between a woman who's indifferent towards romance and a very mysterious and slightly flirtatious man♡

In the *Kaiunshi* series: V.1 - *Trauma Bokushi to Black Shotenin no Kaiun Shinan* V.2 - *Renai Kaiunshi* (Formerly known as *Toaru Black Shotenin no Kaiunjutsu*)