Sekirei

Sekirei (鶺鴒, lit. Wagtail) are superpowered beings with a different genetic code that may react to a human's, and who have been "modified" to be able to exist on Earth. The Sekirei spaceship crashed on Earth in 1999 on Kamikura Island (神座島, Kamikura-jima), and was found by two students, Hiroto Minaka (future MBI chairman) and Takami Sahashi (future MBI head researcher and Minato's mother). On board, the pair had found 108 life-forms, described as "One pillar and 107 baby birds".[5][6]

• The first of them (a pillar, shown as #00,[7] later renumbered and known as #01 Miya) was an adult.
• Eight (later known as #02–09) were embryos, also known as the "Single Numbers".
• 99 others (later known as #10–108) were fertilized eggs.

The adult and the eight embryos are also known as the "Single Numbers". It is hinted that unwinged Single Numbers are equal or even more powerful than their winged counterparts.[8] All of the Sekirei had been given adjustments for the Sekirei Plan, especially the Single Numbers. The adjustments had been used not only for enabling them to exist on Earth but also for making them stronger and for controlling and strengthening their power. Each Sekirei has a Norito (祝詞, lit. "Incantations"), a unique ability that allows them to perform powerful attacks. In order to use the Norito, a Sekirei must engage in mucosal contact with (i.e., be kissed by) their Ashikabi[9] prior to reciting it. Sekirei that are under the same Ashikabi can also merge their powers/techniques in order to create more powerful techniques; this puts most Ashikabi at a disadvantage, as only a few Ashikabi possess more than one Sekirei.

Ashikabi (葦牙) are humans with unique DNA that enable them to empower the Sekirei destined to serve them. Through mucosal contact (kissing) between a Sekirei and its Ashikabi, a Sekirei without wings can become a "winged" or "emerged" Sekirei. Unlike Sekirei, who are mostly buxom women or handsome young men, Ashikabi can be quite innocuous as they can appear in any gender, age and even status. In the series, the power of an Ashikabi can be determined not only by the number of Sekirei he or she has in his or her disposal, but by the bond between them. As the Sekirei battle escalates, five Ashikabi in particular, emerged as the favorites to win the Sekirei Fight, each having winged at least three Sekirei. One of them is Natsuo Ichinomi, an employee of MBI who is also the leader of the Disciplinary Squad, while each one of the other four controls a different area in the city; Minato Sahashi in the North, Hayato Mikogami in the South, Izumi Higa in the East and Nishi Sanada in the West. If an Ashikabi dies or is killed, all Sekirei winged by him or her will also perish.

Jinki (神器, lit. "God instrument"),[10] are eight mysterious artifacts numbered from #1 to #8,[11] also found on the Sekirei spaceship. If all eight of them are gathered, it is possible that they can be used to terminate all Sekirei if the wielder desires.[12] Upon all Sekirei being winged, Minaka puts all Jinki in MBI's possession as prizes for the matches of the Third Stage, and only the Ashikabi with a Jinki are allowed to keep participating in the Sekirei Battle by the end of the stage.

The Sekirei Plan (鶺鴒計画, Sekirei Keikaku), known to Minaka and others as the "Game", is a competition in which the Sekirei and their Ashikabi must fight for survival until the last one of each remains. The true purpose of the plan is unknown, but it is implied to be sinister to some extent. The second anime season ended with the Second Stage completed, but before the Third Stage matches begin.

• First Stage: The Sekirei are adjusted and released in Tokyo. Thereafter, they must find Ashikabi in order to be winged. This stage ends when 90% of the Sekirei have been winged.
• Second Stage: Teito becomes a closed city and no Sekirei or Ashikabi can leave. The Ashikabi must then wing the remaining unwinged Sekirei, and every Ashikabi and their Sekirei must defeat at least one Sekirei.
• Third Stage: A series of battle royales between Ashikabi for possession of the Jinki. Only the Ashikabi who secure at least one of the Jinki until the end of this stage are eligible to advance.
• Final stage: The remaining Ashikabi are brought with their Sekirei to Kamikura Island and must fight among each other for the right to ascend to the Heavenly Palace Kouten and fight the pillar for the prize awaiting the ultimate winner of the Sekirei Battle.

Sekirei is a manga series written and illustrated by Sakurako Gokurakuin. It was serialized in Square Enix's seinen manga magazine Young Gangan between December 3, 2004 and August 21, 2015.[13][14] Square Enix published 18 tankōbon volumes between June 25, 2005 and October 24, 2015.[15][16] A sequel to the manga titled Sekirei: Kanojo no Inai 365-nichi no Koto (セキレイ 彼女のいない365日のこと, Sekirei: 365 Days Without Her) began serialization in Young Gangan on May 2, 2017.[3] Yen Press licensed the original series in North America and began releasing the series with the first volume digitally in November 2015.[17] They later began releasing the series in print in omnibus volumes combining two volumes into one in July 2017.[18]

A drama CD entitled Sekirei Original Drama CD was released on July 25, 2007 by Frontier Works.[19]

The first 12-episode anime series adaptation produced by the animation studio Seven Arcs and directed by Keizō Kusakawa aired in Japan between July 2 and September 17, 2008. The anime is licensed by Aniplex in Japan. The first season is mostly faithful to the overall story structure of the manga series, covering roughly the first fifty-one chapters of the series. The opening theme is "Sekirei" (セキレイ) and the main ending theme is "Dear sweet heart"; both songs are performed by Saori Hayami (#88 Musubi), Marina Inoue (#9 Tsukiumi), Kana Hanazawa (#108 Kusano) and Aya Endo (#2 Matsu). The ending theme used in episode eleven is "Kimi o Omou Toki" (きみを想うとき, "When I Think of You") by Hayami. Six DVDs of the first season were released between October 22, 2008[20] and March 25, 2009.[21] The sixth DVD volume was supplemented with an original video animation (OVA) episode, "Kusano's First Shopping Trip" (初メテノオツカイ, Hajimete no Otsukai, "The First Errand"), featuring Kusano participating in the shopping race with Musubi and Tsukiumi. A Blu-ray box set of the first season was released on June 30, 2010 with three Blu-ray discs and one additional CD.[22] At Anime USA 2009, Funimation announced that the anime's first season was licensed and a DVD box set was released on November 23, 2010.[23][24]

A second season entitled Sekirei: Pure Engagement (セキレイ～Pure Engagement～) began airing on July 4, 2010[25] on Tokyo MX and on July 6, 2010 on some other Japanese networks.[26] The first episode of Sekirei: Pure Engagement was pre-aired on June 13, 2010. The opening theme is "Hakuyoku no Seiyaku (Pure Engagement)" (白翼ノ誓約〜Pure Engagement〜) and the ending theme is "Onnaji Kimochi" (おんなじきもち, "Same Feeling"); both songs are performed by Hayami, Inoue, Hanazawa and Endo, as in the first season. The ending theme for episode 10 is "Oboeteiru kara" (おぼえているから, "Remembering You") by Hayami. A single containing both songs was released on July 21, 2010. The limited edition of the single came bundled with a special three-minute OVA, classified as episode 0, titled "Two-Topic Gossip" (閑話弐題, Kanwa Ni Dai). The full 28-minute version of the OVA was released with the first BD/DVD volume of the second season on August 25, 2010. As with the first season, Pure Engagement is licensed in North America by Funimation,[27] and released the series on January 3, 2012. Funimation's licenses for both seasons expired on February 9, 2017.[28] Manga Entertainment released Pure Engagement in the United Kingdom on November 19, 2012.

Video game cover of Sekirei: Gifts from the Future, released on October 29, 2009.

A video game for PlayStation 2 entitled Sekirei: Gifts from the Future (セキレイ ～未来からのおくりもの～, Sekirei ~Mirai kara no Okurimono~) was released on October 29, 2009 by Alchemist in limited and regular editions.[29][30] Two music pieces implemented for the game's music consist of "Yakusoku I'm with You" (約束 I'm with You, "Promise I'm with You") and "Survive Baby Survive!", both of them performed by Saori Hayami, Marina Inoue, Kana Hanazawa and Aya Endo.[31] The limited edition version was bundled with figures of Musubi and Tsukiumi with Kusano in a panda suit, a 40-minute drama CD, and an illustration of Matsu.[32] While Musubi, Tsukiumi, Matsu, Kusano, Miya, Homura, Uzume and Minato reprise their roles from the anime and manga,[33] four new characters were created by Alchemist consisting of two Sekirei, one Ashikabi and a baby as video game-only characters.

The game takes place in the Sekirei timeline, being played as a visual novel. Minato and the Sekirei of Izumo Inn encounter new characters consisting of Sekirei No. 54, Kuruse (来瀬) (Haruka Tomatsu), Sekirei No. 57, Yahan (夜半) (Ayahi Takagaki), Ashikabi Reiji Koya (甲屋　玲治, Koya Reiji) (Yuichi Nakamura) and a baby referred to as Aka-chan (赤ちゃん) (Haruka Tomatsu).[34] The plot centers around the discovery of said baby, who is being pursued by unknown persons after Minato and the Sekirei find her abandoned in the city.[35]