 If you liked
Monster
|
 ...then you might like
Saibi
|
Both have a very dark atmosphere and story. Both don't have and don't need an extraordinary soundtrack and art style, and they don't use "kawaii" characters or sth, they just have its very realistic feeling characters, which are most of the time quite fuc*ed up, since both anime kinda focus on the deep dark corners of human's souls.