Absolute Boy

The series was based on the world and creature designs of Masahito Satō, created for his atelier named 'Zettai Shōnen'; the title has no connection to boys' love fiction despite what it might suggest.

Voice actress Manabito Suzuki had previously released a CD titled 'Zettai Shōnen' in 1997, but it has no relation to this anime beyond sharing the same title.

The project originated from Toys Works' Satoshi Katō, who built it around Satō's world design shortly after founding the company, developing the concept for five years before it became a series.

Series writer Kazunori Itō originally intended to develop the story as a web-serialized novel, but that plan was never realized and it became an anime instead.

Director Tomomi Mochizuki was chosen at Itō's request, reuniting the pair who had previously worked together on the magical girl daily-fantasy series 'Creamy Mami, the Magic Angel'.

Itō conceived the story as a trilogy and stated that if a third part were ever made, he would want it to be a theatrical film, but no such announcement was ever made and the series remained relatively obscure, airing only on NHK-BS with modest DVD sales.

Itō said he was aiming for the quality juvenile drama feel of NHK's old 'Shōnen Drama Series,' while Mochizuki said he was inspired by the tone of 'Calpis Footen Gekijou' (World Masterpiece Theater).

Voice actress Akiko Kobayashi said the director told her to aim for 'the darkest protagonist yet' when playing Kisa Tanigawa, and she tried to match or exceed how dark Ayumu had been in the first arc.

In the final episode, 'A Fragile Rich End of Winter,' director Tomomi Mochizuki himself provided a voice cameo as a friend of Shigeki Kobayakawa.

The Cat Dance festival ('Neko Odori') depicted in the summer arc is based on a real festival held in Kannami, Shizuoka, in the Tanna Basin, though the anime version differs from the actual festival, which is open to all ages and genders rather than just girls.

The fictional town of Tana is modeled on the Tanna Basin in Kannami, Shizuoka Prefecture, incorporating real scenery along with embellished local history and legends.

The Winter Arc's Yokohama setting is based on real locations, particularly around Minato Mirai, so accurately that voice actress Akiko Kobayashi, herself a Yokohama native, said she was surprised by how faithful it was, even though the geography doesn't always match reality.

Every episode included a comedic 'preview' segment that was not an actual preview, instead featuring in-character skits by the cat Okaka Baba, the chihuahua Taruto, and the dog Roku, voiced by the same actors connected to their owner characters.

In episode 23, 'Light of Darkness that Brings Happiness,' voice actress Ai Shimizu, who plays Taruto, used her real-life ability to speak Chinese to perform a comedic 'Chinese lesson' in place of the usual preview segment.

The background music, composed by Hikaru Nanase, prominently features wordless choral pieces to create a slow, dreamlike atmosphere alongside deliberately muted color tones in the character and background art.

A side-story light novel titled 'Zettai Shōnen: Kamikakushi no Aki - Anamori,' written by Tatsuya Hamasaki with illustrations by Sunaho Tobe, was distributed daily for free via a Bandai Visual mobile site; Hamasaki also contributed to the screenplay for the Yokohama arc.