Over the next few months Haruna grows bigger, which her family attributes to her increased appetite, and begins suffering morning sickness.

Haruna realizes her pregnancy after Yagi teaches an explicit sex ed class, with dolls illustrating intercourse.

The PTA, unaware of the stalking problem and its effect on her home life, find Yagi disorganized and unprepared for classes.

Their classmate Mitsuo – whose father is an obstetrician – guides them through the process, and after the birth the children take turns watching the baby – named Hajime, meaning "beginning" – although Haruna is the only one who can feed him.

Rather than report the news to Haruna's parents, and thus run the risk of national ridicule for not knowing her own student was pregnant, Yagi decides to teach the children how to take care of babies.

[6] While writing the story, Sasō attempted to balance the point of view of the children with that of adults and emphasize the conflict of old and new.

The reviewer described the manga as reaching all of the reader's senses, including through the heat of a dead chicken and the sound of Hajime's heart beating in sync with Haruna's.

It also featured Kumiko Asō, Juri Ueno, Mitsuki Tanimura, Yoshiko Miyazaki, and Ken Mitsuishi.

[12] Prior to its release there were calls for it to be banned for its themes of teenage pregnancy, though screening went ahead as scheduled and the film debuted on 27 September 2008.

[10][13] In his review for The Japan Times, Mark Schilling describes the film as an exposure of "the idiocies and hypocrisies of parents and teachers in dealing with the burgeoning sexuality of tweens, while tenderly celebrating the process of pregnancy and birth", adopting a positive view of early pregnancy while still showing the consequences and scandals a young mother faces.