Oooka Saori

One day, while Yamato is daydreaming and looking at the clouds, a girl comes flying down from the sky! It turns out that she’s looking for her pet, Sanpei, and being the gallant guy that he is, Yamato decides to help this cute but somewhat queer girl. The only thing bothering him is, what kind of pet is Sanpei?

Noa doesn't have a father. She lives together with a working mother. That's why she always hoped for a sibling. One day her mother brings Mizuki and Akari to live with them. Noa is extremely happy with that, but why does Mizuki always show an unhappy face? Will Noa's dream for a sibling come true?