Unlimited Fafnir

Plot

With the sudden appearance of the monsters that came to be called Dragons, the world completely changed. Before long, supernatural girls with the power of the dragons, called D, were born within the human race. The secret existence of the only male D, Yuu Mononobe, was forcefully thrown into the school where the girls of D gathered - Midgard, where he saw the naked body of one of the students, Iris Freyja. Furthermore, upon meeting his long lost sister, Mitsuki Mononobe, Yuu seems to have been enrolled into this school...!? The curtains open as the story about the boy who was supposed to become the strongest assassin and the poorly performing girl unfolds!

Class Brynhildr

Yū Mononobe (物部 悠, Mononobe Yū)

Voiced by: Yoshitsugu Matsuoka The protagonist and the only male "D" in the world. He is a 2nd Lieutenant in NIFL and is sent to Midgard on a mission to prevent "D" girls from becoming dragons and so causing widespread destruction. His superior, Loki considers Yū to be the best Fafnir. Upon arriving in Midgard he is reunited with his younger sister, Mitsuki, after a separation of three years. His dark matter fictional weapon is a gun. He receives kisses from Iris on the lips, and Mitsuki, Tear, and Kili on the cheek. Yū has formed a contract with the Dragon Yggdrasil, which allows him to create a gigantic cannon called Marduk, capable of killing other Dragons, but at the cost of losing his memories. He is revealed to be a Dragon in Volume 8.

Iris Freyja (イリス・フレイア, Irisu Fureia)

Voiced by: Rina Hidaka The female protagonist and the oddball of class Brynhildr. Although she has a lot of power, she is inept at using it. She is on the verge of becoming a dragon and feels resigned to her fate until Yū arrives and changes her outlook at life. She also has romantic feelings for Yū, having given him her first kiss as a thank you for everything he has done for her, and gets embarrassed when he compliments her on her appearance. Her dark matter fictional weapon is a magic staff called Caduceus.

Mitsuki Mononobe (物部 深月, Mononobe Mitsuki)

Voiced by: Manami Numakura The student body president of Midgar and Yū's childhood friend who becomes his adoptive younger sister; she likes her 'brother' very much. She was close friends with Haruka's younger sister, Miyako, and during the invasion of the purple Kraken, she was reluctantly forced to kill Miyako, who had become a dragon. Since then, she has been heavily burdened by the responsibility and hasn't gotten along with Lisa because of it. Her dark matter fictional weapon is a bow called Brionac.

Lisa Highwalker (リーザ・ハイウォーカー, Rīza Haiuōkā)

Voiced by: Hisako Kanemoto One of the main heroines; she is a girl from class Brynhildr who thinks of her classmates as family. She has a strong animosity towards Mitsuki for killing Haruka's younger sister, even though it was the only course of action given the circumstances. She is really close to Tear and is in charge of protecting and taking care of her which brings her and Yuu closer. Her dark matter fictional weapon is a spear called Gungnir.

Firill Crest (フィリル・クレスト, Firiru Kuresuto)

Voiced by: Kana Hanazawa A girl who is into books. Her dark matter fictional weapon is a grimoire called Necronomicon.

Ariella Lu (アリエラ・ルー, Ariera Rū)

Voiced by: Sora Tokui A tomboyish girl who is a skilled martial artist. Her dark matter fictional weapon is a shield called Aegis.

Ren Miyazawa (レン・ミヤザワ, Ren Miyazawa)

Voiced by: Fumiko Uchimura An intelligent girl who is usually seen tinkering on a computer. Her dark matter fictional weapon is a mallet called Mjolnir.

Tear Lightning (ティア・ライトニング, Tia Raitoningu)

Voiced by: Ayane Sakura A "D" girl who transfers into class Brynhildr. She claims to be Yū's wife and strongly believes herself to be a dragon. She had lived a peaceful life until a dragon cult led by Kili burned her house down and killed her parents. Having been praised by the cult, she took pride in being a dragon, but after meeting Yū she changed her outlook and devoted herself to living as a human. She considers Iris to be her rival for Yū's affections, claiming she won't lose to her.

Other characters

Kili Surt Muspelheim (キーリ・スルト・ムスペルヘイム, Kiri Suruto Musuperuheimu)

Voiced by: Marina Inoue The leader of a dragon cult. She holds Tear in high regard and wants her to become a dragon. She disguises herself as Honoka after NIFL took custody of Tear in order to get her back. She became interested in Yū and kissed him after sparing her life.

Honoka Tachikawa (立川 穂乃花, Tachikawa Honoka)

Voiced by: Saori Hayami A mysterious new student at Midgar Academy. It is later revealed that she is actually Kili.

Haruka Shinomiya (篠宮 遥, Shinomiya Haruka)

Voiced by: Rikako Yamaguchi The homeroom teacher of class Brynhildr and Colonel in NIFL. Her younger sister Miyako perished during a battle two years ago.

Loki Jotunheim (ロキ・ヨトゥンヘイム, Roki Yotunheimu)

Voiced by: Nobuyuki Hiyama Yū's superior in NIFL. He ordered Yū to enroll at Midgar to keep a watch on the "D" to keep them from becoming dragons and to kill any "D" who become dragons.

Charlotte B. Lord (シャルロット・B・ロード, Sharurotto B Rōdo)

Voiced by: Risae Matsuda The headmaster of Midgard Academy and one of the Dragons, 'Gray' Vampire. She has the appearance of a grade school girl.

Mica Stuart (マイカ・スチュアート, Maika Stuart)

Voiced by: Mariko Higashiuchi Charlotte's attendant.

Light novels

The first light novel volume was published on July 2, 2013 by Kodansha under their Kodansha Ranobe Bunko imprint. As of February 2, 2017, thirteen volumes have been published.

Manga

A manga adaptation with art by Saburouta was serialized in Kodansha's seinen manga magazine good! Afternoon from March 2014 to December 2015. As of March 7, 2016 the series is complete with four tankōbon volumes.

Anime

An anime television series adaptation by Diomedéa started airing on January 9, 2015. The opening theme is "Flying fafnir" , created and performed by trustrick, while the ending theme is "Ray of bullet" by Rina Hidaka and Manami Numakura voice actresses of anime heroines Iris Freyja and Mitsuki Mononobe respectively from episodes 1-12 though episode 12 was sung together with Hisako Kanemoto, Sora Tokui, Fumiko Uchimura and Ayane Sakura who are also voice actresses of Lisa Highwalker, Ariella Lu, Ren Miyazawa, and Tear Lightning respectively.