Natsumi Kawashima is a 5th grade elementary school girl. She is interested in becoming a supermodel someday. Asumi Yoneyama is her neighborhood friend who likes her very much, but cannot express his feelings. However, Natsumi is attracted to the beautician around the corner, Toji Yashiki. He does not acknowledge her, however, because she is still just a child. One day, she eats a free sample of pink nuts, and wakes up the next morning as a sexy teenager! On sight, Toji asks Natsumi to be his girlfriend. As much as she is flattered, she only goes on one date with him, before deciding to end it. After all, she still has the mindset of a child and is not ready for an adult relationship. In the meantime, Asumi is very jealous and worried about her, but is happy for the choice she made. Natsumi is kidnapped and dragged off to meet the creator behind the pink nuts, Yuunosuke Morniyama. He's a bit of a mad-scientist, and made the pink nuts to accelerate the growth of animals. However, the nuts are still under development, so there may be risks. Thus, he throws out Natsumi's nuts, but she manages to steal a few, unable to forget the Toji's invitation to make her a model. Soon after, she finds out that Asumi has sent out photos of her adult form to a magazine, and she wins their beauty contest. The prize is a free trip to a tropical island, where the photo shoot will be held. Asumi and Yuunosuke tag along to the island, and have a good time. An extra short-story, "Fortune Cake", is included in the back of the volume.