Kohtaro (Mocomichi Hayami) is a poor, struggling writer, who works mainly on mobile phone novels. He has aspirations to become a best-seller novelist, but in reality he is far from succeeding...he makes a bare living working as a freelance writer for a weekly magazine.

One day, Kohtaro's older sister Hinako (YOU), a famous and carefree actress, suddenly disappears. It seems that she has moved to Hollywood to pursue her goal. Although Hinako and Kohtaro are not blood-related, her six-year-old love child, An (Riko Yoshida), shows up on Kohtaro's doorstep intending to stay. An is a successful child star, and her cheeky character annoys Kohtaro.

Furthermore, An's manager Mineko (Rosa Kato) reminds Kohtaro to handle their "important star" with extra care, and gives him a handbook of how to raise An. What will happen when this young man and little girl with different backgrounds, personalities and lifestyles begin to live together? This heartwarming story touches viewers as the two previously lonely characters are reminded of the warmth and affection that relationships with others can bring to them.