Death Contract

For as long as time the dead and the living were there. And the living feared the dead. After both began to settle into their plains. The spirits remaking life and the living easing into peace between the races. Then the living started to test their fates and bring the ghosts into the living, under a contract. The contract enstates that the contractor obtains the sprits service, and at the contractors death the soul is taken by the spirit, and the spirit obtains a death coin. Of which will grant the spirit anything. But when one highschool student of the living plain contracts three ghosts. How will they all end up?