Keishirou Sakuhara, a 28 year-old, handsome and unmarried man, is a very popular young novelist but is extremely private about his personal life. When accepting the job offer to work at his family as a housekeeper, the 18 year-old girl Momoko Ishino had to accept the condition "Absolutely do not reveal what happens in the house to the outsiders!!", which made her even more curious about the mysterious man. Only when she found out that Keishirou's secret was revolving around these 4 adopted children! The eldest son Kodama is in 9th grade, the second son Hikari is in 8th grade, the third son Nozomi is in 4th grade, and the youngest daughter Asahi is in 3rd grade. Being afraid that the housekeepers would come with bad intention towards their father, the 4 children always play tricks on them. It's so frustrating that no one can stand working there for a week. What will Momoko do to make friends with and take care of these mischievous and individualistic children? Also, how would she face her feelings for Keishirou when she realizes that Kodama is interested in her as time passes by?