At one time, an English-language version of the manga was licensed by Seven Seas Entertainment for distribution in North America under the title Nymphet, but they ultimately decided not to publish it due to controversies over its content.

He is placed in charge of Class 3-1, where one of his students, a mischievously precocious nine-year-old girl by the name of Rin Kokonoe, develops a crush on him and proclaims herself as Aoki's girlfriend.

The first chapter of a two-part "pilot" for Kodomo no Jikan appeared in the premiere issue of Futabasha's seinen manga magazine Comic High!

While the aforementioned pilot is not considered part of the ongoing series' canon in spite of the shared name, largely identical main cast, and common central theme, many situations and ideas initially introduced there were revisited in the eventual manga series—and thus incorporated into official continuity—albeit in (slightly) altered or expanded form.

It has three hosts—Eri Kitamura, Kei Shindō, and Mai Kadowaki, who played Rin Kokonoe, Kuro Kagami, and Mimi Usa in the anime, respectively—and was produced by Bandai Visual and Lantis.

[19][20] In an official press release, TV Saitama stated that their decision was heavily influenced by the then-recent capture of Takayuki Hosoda, a notorious Japanese child pornographer who was revealed to be an elementary school vice principal.

[21][22][23][24] Plans for Chiba TV and KBS Kyoto to air the series remained unchanged, and the anime premiered on Japanese television on October 12, 2007, running for twelve episodes until December 28, 2007.

However, some of its content suffered censorship to varying degrees, from animated panels obscuring parts of the screen and sound effects being used to "bleep" out dialogue in some instances to full suppression of both audio and video in others.

Ohime-sama Dakko" (れっつ!おひめさまだっこ) by Eri Kitamura, Kei Shindō, and Mai Kadowaki, the voice actresses for Rin Kokonoe, Kuro Kagami, and Mimi Usa, respectively.

[36] Kodomo no Jikan was originally licensed for distribution in North America in 2006 by the Los Angeles–based company Seven Seas Entertainment, the first volume of the manga having been slated for an early 2007 release.

In a written statement, the president of Seven Seas Entertainment, Jason DeAngelis, observed that "those who are speaking out against Nymphet seem to be disturbed by the relationship between two characters in the story, namely an elementary school student and her adult teacher" and decided to delay the release of the manga so that he could "have an open dialogue with the large book chains and other vendors.

The two embrace in an effort to stay warm by sharing body heat, and Rin takes the opportunity to rub her crotch against Aoki's, almost causing him to get an erection.

"[41] The author went on to cite instances in later volumes that showed intimate relationships between cousins and a bath scene with a child and adult, going on to say that, "my honest feeling is, 'It's unfortunate, but what can I do?

'"[41] Former manga translator Toren Smith commented on the issue in favor of its content, accusing people who support the reverse gender scenario in series such as Negima!

[42] Anime News Network writer Zac Bertschy expressed complete disapproval of the content present in Kodomo no Jikan, categorizing it as lolicon and "comic book kiddie porn".