If you liked
Mairimashita! Iruma-kun
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...then you might like
Mashle
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Both main characters end up in a school where they literally can't do what the students are supposed to be able to do (e.g. magic). Both characters are very naive and inhumanly good at one particular thing (Mashle - being strong; Iruma - dodging). Although they have a huge handicap in their way, they both somehow manage to fool everyone into thinking they belong.
If you liked
How to Use a Returner
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...then you might like
Overgeared
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Both MCs are weak at first, with attitudes that can be considered by many as scummy. They both gain somewhat obscure production-based classes in the fantasy game-based worlds they are in.
If you liked
Omniscient Reader's Viewpoint
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...then you might like
I'm the Max-Level Newbie
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Both set in the real world that suddenly becomes a game that is well-known to the MC, who uses that knowledge to gain power efficiently.
If you liked
Villains Are Destined to Die
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...then you might like
Surviving Romance
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- MC is from another world and now living in a setting from media they're familiar with - time loop - new world's System is very "strict" about MC's actions at first
If you liked
Omniscient Reader's Viewpoint
|
...then you might like
The Novel's Extra
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Both have protagonists who are already familiar with the novel they end up in and have abilities related to having prior knowledge of the story. Neither of them are meant to be the protagonist of the actual story. Both worlds feature monsters and magic.