Humanity Has Declined

Plot

Humanity Has Declined is set in a post-apocalyptic world where the human civilization has regressed and humanity keeps decreasing in numbers. The story follows an unnamed girl who acts as a mediator between humanity and the "fairies" who are small elf-like creatures attracted by sweets and happy things, but also have the habit to cause trouble to her with their powers in their endless search for amusement.

Characters

The Heroine (主人公, Shujinkō)

Voiced by: Mai NakaharaGenerally referred to as either "I" (わたし, Watashi) or "Ms. Sweets" (お菓子ちゃん, Okashi-chan), the heroine is a sensible mediator between humankind and the fairies. She is one of the few humans left capable of creating sweets, which causes the fairies to naturally flock to her. Having observed the slow decline of humanity, her outlook on life is grim.

Grandfather (祖父, Sofu)

Voiced by: Unshō IshizukaThe heroine's grandfather, a researcher and firearm fanatic. Thanks to the fairies, he met with his granddaughter when he was 13 years old and a time paradox was created.

Assistant (助手さん, Joshu-san)

Voiced by: Jun FukuyamaA young boy in a Hawaiian shirt who almost never speaks and serves as the heroine's assistant. He is rarely seen without a video camera.

The Fairies (妖精さん, Yōsei-san)

Voiced by: Yumiko Kobayashi, Sayaka Aoki, Satomi Akesaka, Nozomi Sasaki, Hisako Kanemoto, Satomi AraiThey are mysterious beings with advanced technology that could be called magic. The fairies have permanent smiles on their faces and very literal, honest viewpoints on everything. Despite their cute appearance, they seem to have a total disregard for human safety. The presence of many fairies is supposed to increase one's fortunes, but they cause potentially fatal situations. They often request sweets from the heroine in exchange for their assistance.

Y

Voiced by: Miyuki SawashiroAn old classmate of the heroine's whose job is to identify human artifacts. She discovers a yaoi doujinishi from our era, however, and then spends her time self-publishing yaoi doujinshi.

Pion/P-ko (ぴおん/P子)

Voiced by: Nana MizukiA humanoid robot with cat ears. She makes sound effects whenever she acknowledges something of interest. Her original name is "Pioneer".

Oyage/O-taro (おやげ/O太郎)

Voiced by: Nobuyuki HiyamaPion's partner, who she is searching for. His original name is "Voyager".

Curly (巻き毛, Makige)

Voiced by: Hisako KanemotoThe heroine's classmate from her school days, who is disturbingly affectionate.

Light novels

Jinrui wa Suitai Shimashita began as a light novel series written by Romeo Tanaka. Shogakukan published 11 volumes between May 24, 2007 and September 16, 2016 under their Gagaga Bunko imprint; nine comprise the main story, while the other two are short story collections. For the first six volumes, the novels featured illustrations by Tōru Yamasaki, but he was replaced by Sunaho Tobe in 2011. Shogakukan republished the novels with Tobe's illustrations between November 18, 2011 and March 16, 2012. The novels are published in Taiwan by Sharp Point Press.

Manga

One chapter of a manga adaptation, illustrated by Rei Neyuki, was published in the March 2010 issue of Shogakukan's Monthly Ikki magazine. It was announced in the May 2010 issue that the manga had gone on an indefinite hiatus and was ultimately cancelled. Another manga, illustrated by Takuya Mitomi and titled Jinrui wa Suitai Shimashita: Nonbirishita Hōkoku (人類は衰退しました のんびりした報告), was serialized between the January and July 2012 issues of Monthly Ikki. A single tankōbon volume for Nonbirishita Hōkoku was released on July 30, 2012. Mitomi also illustrates the four-panel comic strip manga Jinrui wa Suitai Shimashita: Nonbirishita Hōkoku 4-koma (人類は衰退しました　のんびりした4コマ), which began serialized in the August 2012 issue of Monthly Ikki. A manga illustrated by Terae Kichijō and titled Jinrui wa Suitai Shimashita: Yōsei, Shimasu ka? (人類は衰退しました ようせい、しますか?) started serialization in the March 2012 issue of Media Factory's Monthly Comic Alive. The first volume of Yōsei, Shimasu ka? was released on June 23, 2012; three volumes have been released as of February 23, 2013.

Anime

An anime TV series adaptation, produced by AIC A.S.T.A. and directed by Seiji Kishi, aired in Japan between July 2 and September 17, 2012; it was also simulcast by Crunchyroll. The screenplay was written by Makoto Uezu, and the chief animation director Kyūta Sakai based the character design used in the anime on Sunaho Tobe's original concepts. Bonus episodes are included on the Blu-ray Disc and DVD releases. The opening theme is "Real World" (リアルワールド, Riaru Wārudo) by Nano Ripe and the ending theme is "Yume no Naka no Watashi no Yume" (ユメのなかノわたしのユメ, My Dream Within a Dream) by Masumi Itō. Sentai Filmworks has licensed the series for subtitled BD/DVD release in North America in December 2013.

Episode list

Bonus episodes