Don't let go.

Marian Cross is abusive to Allen walker, he goes to school everyday with bruises and cuts but always blames them on the cat, Timcampy.His friends Leenalee Lee, Lavi and Kanda start to become suspicious of what is really happening and start to question his stories... What will happen when Allen collapses on Kanda's doorstep and has to stay the night.

Disclamer: I don't own D.Gray man because if I did there would be episodes just for Yullen.