My One-Hit Kill Sister

My One-Hit Kill Sister (異世界ワンターンキル姉さん〜姉同伴の異世界生活はじめました〜) is a Japanese web novel series written by Konoe. It was serialized online on the user-generated novel publishing website Shōsetsuka ni Narō from December 2019 to June 2023. A manga adaptation, illustrated by Kenji Taguchi, was serialized online via Shogakukan's Sunday Webry website, as well as the manga magazine Monthly Sunday Gene-X, from March 2020 to July 2023. It chapters were collected in twelve volumes. An anime television series adaptation by Gekkō aired from April to June 2023.

Plot
High school student Asahi Ikusaba, an RPG otaku who has always dreamed of adventuring in another world, gets his wish when he is rendered comatose after getting hit by a car while saving a child. Finding himself in a fantasy world, he pursues his desire to become an adventurer. However, he is outmatched by high-level monsters he stumbles across on his very first quest. Suddenly, his overprotective older sister Maya appears and saves his life. Partnering up with him, the two begin to make their way in this new world, even though Asahi comes to fear his sister's overbearing affection for him more than the various dangers this world has to offer.

Super Asahi Legion

 * Asahi Ikusaba (軍場 朝陽)
 * A high school student whose consciousness was displaced into another world after getting hit by a runaway car. Soon after his arrival, he tried to establish himself as an adventurer, only to find that he has neither a super-high level nor any superpowers. When Maya follows him into the other world, he finds himself overwhelmed by both her paradoxically superior abilities and her smothering affection for him. Despite Maya doing all the work, Asahi ends up being hailed as the hero.
 * A high school student whose consciousness was displaced into another world after getting hit by a runaway car. Soon after his arrival, he tried to establish himself as an adventurer, only to find that he has neither a super-high level nor any superpowers. When Maya follows him into the other world, he finds himself overwhelmed by both her paradoxically superior abilities and her smothering affection for him. Despite Maya doing all the work, Asahi ends up being hailed as the hero.


 * Maya Ikusaba (軍場 真夜)
 * Asahi's tomboyish older sister who has an obsessive brother complex, which oftentimes drifts off into a more sexual theme. After her brother's accident, she knocked her head against a wall, lost consciousness, and found herself in the same other world as him. Upon her arrival, her desire to protect Asahi bestowed her with tremendous physical and magical cheat abilities, and she makes herself his silent adventuring partner, who keeps her abilities secret from the public eye. She easily takes this arrangement and Asahi's resulting fame in stride, as her only concern in life is to keep him safe.
 * Asahi's tomboyish older sister who has an obsessive brother complex, which oftentimes drifts off into a more sexual theme. After her brother's accident, she knocked her head against a wall, lost consciousness, and found herself in the same other world as him. Upon her arrival, her desire to protect Asahi bestowed her with tremendous physical and magical cheat abilities, and she makes herself his silent adventuring partner, who keeps her abilities secret from the public eye. She easily takes this arrangement and Asahi's resulting fame in stride, as her only concern in life is to keep him safe.


 * Kilmaria (キルマリア)
 * A powerful general of the army of the Demon King. She thrives on a challenge for her abilities, but usually finds herself too powerful for most opponents. After encountering Asahi by chance—and trying to destroy him on the basis of his growing heroic reputation—she meets her match in the overprotective Maya.
 * A powerful general of the army of the Demon King. She thrives on a challenge for her abilities, but usually finds herself too powerful for most opponents. After encountering Asahi by chance—and trying to destroy him on the basis of his growing heroic reputation—she meets her match in the overprotective Maya.


 * Sophie (ソフィ)


 * Gloria Brigandine (グローリア・ブリガンダイン)


 * Kuon (クオン)

Other characters

 * Tanya (ターニャ)
 * A clerk of the adventuring guild in the city/town of Epiphoneia in the kingdom of Caesarion, the domain Asahi and Maya end up in. She quickly becomes Asahi's greatest fan after "his" first adventuring successes.
 * A clerk of the adventuring guild in the city/town of Epiphoneia in the kingdom of Caesarion, the domain Asahi and Maya end up in. She quickly becomes Asahi's greatest fan after "his" first adventuring successes.


 * Siegfried (ジークフリート)
 * A high-level adventuring fighter, also known as "Dragon Hunter", and leader of the Clan Balmuc adventuring group.
 * A high-level adventuring fighter, also known as "Dragon Hunter", and leader of the Clan Balmuc adventuring group.

Novel
Written by Konoe, My One-Hit Kill Sister was serialized online as a web novel on the user-generated novel publishing site Shōsetsuka ni Narō from December 28, 2019, to June 17, 2023. A print version of the novel has not been released.

Manga
A manga adaptation, with art by Kenji Taguchi, started serialization online via Shogakukan's Sunday Webry website on March 6, 2020, as well as the manga magazine Monthly Sunday Gene-X since April 17 of the same year. The series finished on July 28, 2023. Shogakukan collected its chapters in twelve volumes, released from July 10, 2020, to September 12, 2023.

Anime
On March 11, 2022, an anime adaptation was announced on the seventh volume of the manga. It was later confirmed to be a television series animated by Gekkō and directed by Hiroaki Takagi, with Yōhei Kashii in charge of series' scripts, Yūji Hamada designing the characters, and Kenichi Kanagawa designing the monsters. It aired from April 8 to June 24, 2023, on Tokyo MX and other networks. TrySail performed the opening theme song "Karei One Turn" (華麗ワンターン), while VALIS performed the ending theme song "Mukyū Platonic" (無窮プラトニック). On August 6, 2022, during their industry panel at Crunchyroll Expo, Crunchyroll announced that they licensed the series outside of Asia.