Diaries Of A Ghost ~ Hetalia Highschool AU

Alfred died in the 1900s, though he still hangs around school. He likes to observe people, people have changed a lot over the years.
One day he notices that a boy can see him, and that the boy is dead. His name was Gilbert.
The next day another boy died. He was named Lovino.
Alfred found out that they were both murdered, but the question is:
What can he do about it as a ghost?
He gets the help of a certain sorcerer and...well..things don't go too well.