 If you liked
Tsuujou Kougeki ga Zentai Kougeki de Ni-kai Kougeki no Okaasan wa Suki desu ka?
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 ...then you might like
Isekai One Turn Kill Neesan: Ane Douhan no Isekai Seikatsu Hajimemashita
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Both shows take place in another world where the MC is a guy who is not very strong, and a family member that's overpowered pretty much making the guy useless when it comes to adventuring.
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Recommended by GridironOtaku
The reincarnation in another world is just too lonesome for those chosen ones, without the companion of their family and relatives.
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Recommended by SgtBateMan
Both are fantasies where the main character is weak, but his mom/sister is overpowered.
They're about a guy who gets isekai'd to a game world alongside an older female relative (his older sister in One Turn Kill Neesan, his mother in Okaa-san Online), but he isn't strong at all while she's extremely OP, so he's forced to depend on her.
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Recommended by Ionliosite2