AU. For sixteen years old Luffy, his big brother Ace is only thing that keeps him going. Then Ace had to get that stupid lung cancer. Ace's physical condition isn't getting any better, and same goes to Luffy's mental condition. Nothing seems to help, but then green haired boy comes to Luffy's class and changes everything. ZoLu, brotherly AceLu and in future brotherly SaboLu.