Harry and Jason are just two boys in two different cities in two different contintents trying to get a good grade on this new assignment their teachers created. Or at least, that's how it began. Now, it's something way more.
Harry Potter and Diamond Black are two best friends trying to raise a child in a world that no longer cares to protect itself. It only makes sense that they'd leave the world, doesn't it? Central City is different. Central City is their home. One they must protect.
Harry, Ron, Fred, and George didn't show up to class and Remus wants to know why. Hermione reveals the ridiculous explanation and gets a story about Remus's school days.