My One-Hit Kill Sister

It chapters were collected in twelve tankōbon volumes. An anime television series adaptation by Gekkou aired from April to June 2023.

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.

Asahi Ikusaba (軍場 朝陽, Ikusaba Asahi) Voiced by: Yuki Sakakihara 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, Ikusaba Maya) Voiced by: Haruka Shiraishi 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, Kirumaria) Voiced by: Ami Koshimizu 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, Sofi) Voiced by: Azumi Waki Gloria Brigandine (グローリア・ブリガンダイン, Gurōria Burigandain) Voiced by: Sora Tokui Kuon (クオン) Voiced by: Konomi Kohara

Tanya (ターニャ, Tānya) Voiced by: Rio Tsuchiya 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, Jīkufurīto) Voiced by: Yuma Uchida A high-level adventuring fighter, also known as "Dragon Hunter", and leader of the Clan Balmuc adventuring group.

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.

A manga adaptation by Kenji Taguchi started serialization online via Shogakukan's Sunday Webry website on March 6, 2020, as well as the seinen 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 tankōbon volumes, released from July 10, 2020, to September 12, 2023.

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 Gekkou 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 first opening theme song "Karei One Turn" (華麗ワンターン; "Splendid One Turn") and the second opening theme song "Follow You!", while Valis performed the ending theme song "Mukyū Platonic" (無窮プラトニック; "Forever Platonic"). On August 6, 2022, during their industry panel at Crunchyroll Expo, Crunchyroll streamed the series worldwide outside of Asia.