 If you liked
Isekaigaeri no Yuusha ga Gendai Saikyou!
|
 ...then you might like
Kikan shita Yuusha no Gojitsudan
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Similar plots. The main character was summoned to another world to defeat the demon king.He defeats the demon king and is returned back to Japan with practically no time passing. The main character retains all his abilities he learned in the other world and is able to use that abilities in Japan. So no one is aware the main character went to another, so he tries to keep his abilities a secret.
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Recommended by ezikialrage