Yuki is a 10-year old girl living in an orphanage, until she is adopted by Mr. and Mrs. Iwabuchi. Yuki's new stepsister Sanae is a nice girl who has a heart disease.

Rina Ozaki a little bit tomboy, but honest and cute girl. She lived happy life with her family in their mansion in Tokyo, but after her father who was a pilot crashed and went missing, the unfortunate events continued and the family forced to move to an apartment building on the center of Tokyo. However, Lina helps her family and friends and try to be happy.

Yuka's dad went to study art in France and never came back, leaving Yuka alone. Yuka becomes lonely and the children around her look at her with cold eyes, but little by little she starts conquering their hearts.