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Hey I'm looking for a "tansported to a new world"manga
It starts off with this guy in a penthouse talking about how the world sucks for not knowing how to get rich or something along those lines
But then a hole upens up in his house and he falls through
He then later has to work in a mine for some demon company to collect rare rocks but he finds a secret entrance to a deeper level to find ever rarer rocks but he meets a dragon girl that he has to feed or she'll he him.
