Maybe I'm misunderstanding something, but doesn't this first dungeon run together already make the contract MC signed a bad deal? The rich girl is paying him 300,00 yen each run but MC basically soloed that snake and has to give them 30% of 100mil which is 30mil. That's also not accounting for this special map they just found and the fact that he keeps getting disrespected by the rich girl's attendant chick.