 If you liked
Asshou
|
 ...then you might like
Kimi ni Aisarete Itakatta
|
Asshou is more of a mystery thriller, while Kimi ni Aisarete Itakatta is more of a psychothriller.
But both look at relationsships in a more mature / adult way and have some dark content and really showcase how your environment (friendgroups / parents) affect the characters mind.