Suddenly President of an Adventurer Company

Dungeons suddenly pops out around the world releasing monsters that made humanity almost fell to the brink of extinction when all hope was lost humans discovered "Ingenium" crystals found inside dungeons with human ingenuity they discovered that ingenium can be turned into lots of things for example it can be turned into weapons or used as an energy supply, etc. With the demand for ingenium adventurer companies pops up exploring dungeons far and wide hoping to make a profit.