"loveless"

Yeah just like the name I am using loveless is an anime. An anime that revolves around the world of a middle school student that had an amnesia because of a traumatic incident. His only brother Aoyagi Seimei (beloved) was killed in front of him..And after a year a strange college student came to his new school and told him who killed his brother.And he told him that he was beloved's fighter.His brother was killed by an unknown organization called the "seven moons".
It's a "shounen ai"(boys love) anime but it only ran for 12 episodes so i have to read its manga that has almost 87 volumes.