The train pulls to a stop and a wave of people get off, which isn't surprising. They end up carrying Hisoka off the platform in a solid wave of people, but eventually they disperse. Hisoka only really has to walk another couple of blocks to reach the university. The gates are open and a large group is in the courtyard, one ordering people around as they scramble, it looks like they're getting ready for a trip.
The one giving orders is the professor Hisoka is looking for, Doctor Amegaki Tesla, noted as the leading archaeologist in the province and the leading expert in ancient linguistics in Japan. By what he can gather, Hisoka can tell they're heading to a digsite found just outside of Inaba, surprisingly close to Ryoo High.
Spoiler
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Amegaki = Rain Kid or Rain Brat