is a Japanese manga series written by Kotoko and illustrated by NiKrome. It began serialization on Kadokawa Corporation's KadoComi and Nico Nico Seiga websites in September 2022. A light novel version began publication under Fujimi Shobo's Kadokawa Books imprint in July 2024.
Synopsis Ichika befriends a boy named Cecil through a magic hand mirror that is connected to another world. One day, the hand mirror disappears along with Ichika's older sister Karen. One year later, the mirror reappears and transports Ichika to that world, where she later finds Cecil, and her long-lost sister Karen. After Karen reveals to Ichika that she stole her identity after getting transported, Ichika ultimately decides to continue in this world and find her destiny as "Karen".
Characters
Media Manga Written by Kotoko and illustrated by NiKrome, In Another World, My Sister Stole My Name began serialization on Kadokawa Corporation's KadoComi and Nico Nico Seiga websites on September 1, 2022. Its chapters have been compiled into five volumes as of June 2026. The series is licensed for English publication by Yen Press.
Light novel A light novel version of the story, also written by Kotoko and illustrated by NiKrome, began publication under Fujimi Shobo's Kadokawa Books imprint on July 10, 2024. Two volumes have been released as of June 10, 2026.
Other In commemoration of the release of the second volume, a voice comic adaptation was uploaded to Kadokawa Corporation YouTube channel that same day. It featured performances from Suzuko Mimori, Asami Seto, Takuya Eguchi and Kensho Ono.
Reception The series was ranked third in the Nationwide Publishers Recommended Comics list of 2024.
See also Breaking Up Was the Plan, the Duke Falling For the Villainess Was Not!, a light novel series written by Kotoko The Final-Boss Prince Is Somehow Obsessed with the Chubby Villainess: Reincarnated Me, another manga series written by Kotoko Grinding My Way to a Happy Ending: If Only My OP Big Bro Didn't Make Things So (Sister) Complex!, a light novel series written by Kotoko
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