D.Gray-Man

D.Gray-Man took time setting at the end of 19th century. Allen Walker is a 15 year old boy who abandoned by his own parents due to his left arm deformed.
Then, he is adopted by Mana Walker, A clown from small circus who can't shed a tear. During Mana death, a young Allen depressed and want to resurrect him. By
Millennium Earl help, Mana is resurrect in the body of akuma (lit. demon), and then ordered by Millennium Earl to kill Allen. In this situation, Allen left
hand suddenly transform into a weapon like claw, and immediately destroy Mana, before destroyed, Mana cursing Allen by hurting his left eye, and that eye can
see the soul inside akuma. After that incident, Allen meets Marian Cross and become his pupil. Marian Cross told Allen that akuma is a killing machine which
created by inserting human soul that can only summon by the one they loved. Later, after 4 years training, Marian Cross ordered Allen to go to Black Order
with his golem (after said that, he smack Allen's head with hammer). When presenting himself to Black Order, he mistaken by enemy due to his left eye and
attacked by another exorcist, Yuu Kanda. After cleared by Lenalee, Allen joining Black Order and learn from Hevlaska that he is the Prophesied "Destroyer of
Time". In progress, Allen meets Lavi, an ancestor of Bookman. Allen also encounters the Millennium Earl, his akuma army and the Noah Clan, a group of people
who aid Millennium Earl plan of World Demise.