The first time (1-16 volumes)

Publisher: Shogakukan
Author：Toshi Fujiki
Size: 112mm x 174mm
Number of books: 16
Language: Japanese
Category: Shonen Manga,Manga
Latest Release Date：2012-07-18

Synopsis:
Fifteen-year-old Akuno Jiro is a former scientist for an evil organization. But after his organization is crushed by the righteous, he ends up in the care of his relatives, the Watari family, where he meets Kyoko, the only daughter of the same age. He is now under the same roof with his only daughter, Kyoko, and the situation is a comedy of troubles!
A mysterious sister and brother from an evil organization have come to stay at the house where Kyoko, a tiny girl with glasses and breasts, lives! The younger brother, Jiro, in particular, has no common sense, is always pushing her to have him remodeled, and before she knows it, they're classmates...?
One morning, a high school girl, Kyoko Watari, wakes up to find that she is about to be restrained and remodeled by a mysterious boy. The man, Akuno Jiro, is her cousin, and it seems that he and his sister, Eiko, have come to live with the Watari family because the family's evil organization has been crushed. Kyoko is perplexed by this development, and Jiro stresses the appeal of the modification, saying, "It is possible to make your poor breasts bigger," but this naturally angers her...?