Unstable young female characters able to go through great lengths for the one they love, if you may a sick love
They both share the psychological and abuse tags and are very dark on those themes, Silenced seems a bit darker since we are dealing with children abuse, Traces of Sin has child abuse as well, even if it is not as explicit, however there is abuse towards the intellectually impaired. Definitely worth the watch for those that enjoyed Silenced.
There is murder, investigations, the whole disturbing feeling, but meanwhile Kanako bets in a more physical form of violence, Traces of a Sin is something more psychological, there are some other similarities as well.