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B-Rank.
The Rank that any Hunter wished to reach as fast as possible.
It was at this Rank when things became different for them.
B-Rank Hunters were considered special people, celebrities, even.
They were treated excellently by the society of any Sector, and they were able to be above the law, and even the government often decided to not mess with them and even help them, incentivizing their growth so such Hunters would stick with them and also, at the same time, protect the Sector through their dependence to the government thanks to their treatments.
Noah decided to reach B-Rank as fast as possible so he and his party could get out of the school without being persecuted by the government anymore.
They would easily be able to prove their strength by going into a Guild Registration center, register as B-Rank Hunters by upgrading their license cards, and then, by paying a large fee, register a guild for themselves.
Check "The Protagnist's Sister Is Actually the Strongest"!