Percy Jackson and Harry Potter (crossover)

Nico di Angelo left and soon the demigods leave to meet the wizards at Hogwarts, both trying to relax after the war or wars that they had just faced. Everything's well with the wizards finding friends among the demigods, but suddenly Nico shows up again, but not alone. Not only does Nico and seven other demigods show up, but evil forces are rising up as well. Can the three groups work together, or will the trust between the wizards/demigods and the new group shatter their hope of saving the world once again?