Darker than Black: Kuro no Keiyakusha Gaiden

Both anime deal about a human that behaves like a doll, and both girls try to understand the things they feel and how important their companion is to them. However, darker than black has a less major impact on the relationship between the 2 main characters than Violet Evergarden has.  

Both are set in a dark sci fi setting with unsettling violence in Japan. Fuse and Hei start off as killers but gradually develop feelings later on with the female lead. Both have similar endings as well. 

At first, both these animes have a similar drama component: in order to do their duty main characters have to kill their loved ones, however in Ga-Rei Zero drama is payed more atention to and is more deep than in DTB. Both these series deal with organisations exterminating threats to the mankind (ghosts in GRZ case and contractors in DTB case). Sure thing there are mystical powers and supernatural abilities included. Also, you will feel painfully sorry for main characters whichever you watch. In case you watched DTB only because of action and fights, it's unlikely you will like GRZ. There is action (actually, half of the series is swordsfighting), but it is drenched with main character's emotions and incertitude . But if you have nothing against adversaries trying to resolve an agonizing dilemma of fighting against their ex-friends, you will definetely enjoy it. read more