 If you liked
Made in Abyss
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 ...then you might like
Shuumatsu Train Doko e Iku?
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Both are adventures featuring young main characters investigating something mysterious by going deep inside a place they are not familiar with where they run into may sights and siturations on their way
Both takes place in a fantastical world with very unique and intriguing worldbuilding. they also have similar pacing and some fansurvace