The anime adaptation of My One-Hit Kill Sister (Isekai One Turn Kill Nee-san) is set to premiere in 2023. A visual has been released.

The cast of My One-Hit Kill Sister includes Yuuki Sakakihara as Asahi Ikusaba, Haruka Shiraishi as Maya Ikusaba, and Ami Koshimizu as Kilmaria. On the staff side, Hiroaki Takagi (Love After World Domination and Orient episode director and storyboarder) is directing with Ryouhei Kashii (Battle Athletes Victory ReSTART!) as series composer and Yuuji Hamada (The Gymnastics Samurai animation director, Kase-san co-prop designer) as character designer. 

Gekkou is producing the show. Crunchyroll previously revealed that it would stream My One-Hit Kill Sister.

The anime is based on the Shogakukan-published manga written by Konoe and illustrated by Kenji Taguchi, which is serialized on Sunday Webry and published under the Shonen Sunday Comics label. My One-Hit Kill Sister began in 2020 and will release its eighth tankoubon volume on August 12. The manga is based on Konoe’s Shousetsuka ni Narou web novel that began in 2019.

The premise of My One-Hit Kill Sister involves the boy Asahi ending up in another world after an accident. He tries to enjoy this new world, but discovers that he is horribly weak. On the other hand. his brocon sister Maya, who was reborn in the same world after striking her head while chasing Asahi, possesses the strongest ability of this world.

Source: My One-Hit Kill Sister website (1), (2)