While realizing his feelings for his cousin, whom he had been caring for in place of his parents, Yūji experienced heartbreak. This was noticed by his senior at university, Makki, and to keep it a secret, Yūji began “keeping” his senior at home. Makki was like a real cat, free-spirited and unrestrained. As they lived together, things gradually...!? A spoiled beautiful cat × a heartbroken man, an unexpected cohabitation life ♥

Raised by her strict uncle, Annelise lives an austere life. One day, when she learns that the man her late father chose to be her guardian, Marquis Saintjohn, is living in London, she seeks her freedom through him. When she sees him for the first time, she’s surprised to discover that he’s the very man who stole her heart while she was out in the city. She decides they were fated to fall in love, not become guardian and ward. She’d thought him a kind noble, but he turns out to be a troubled man who coldly keeps her at a distance.

"Miss Yuka Kunitachi, please be my daughter's mother." --What are you saying to the first person you see, this guy?! My father embezzled 500 million won from the company he worked for and ran away, so I, Yuka Kunitachi, ended up marrying a man I didn't know. My counterpart is Kaji Ryo, the president of the company where my father worked. Besides, he is a single dad with a five-year-old daughter. As a virgin who doesn't even known love yet, he's too much for me to bear... **Note:** The manga is re-published with new name titled "Kosodate Shachou to Kousai 0-nichi Keiyaku-kon (子育て社長と交際０日契約婚)" in 2022 under the same publisher.