Before Ichika and her sister Karen ever get spirited away to another world in this isekai manga, we already know something is up in In Another World, My Sister Stole My Name.
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Editor’s Note: There will be mild spoilers for the first volume of the In Another World, My Sister Stole My Name manga.
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The first mystery, right off the bat, is Karen stealing Ichika’s identity and name in In Another World, My Sister Stole My Name.
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But the nature of this isekai story and Ichika’s summoning are the main mysteries in the In Another World, My Sister Stole My Name manga.