 If you liked
Oyasumi Punpun
|
 ...then you might like
Ana Satsujin
|
In both manga you can see the protagonist slowly losing their sanity and innocence leading both protagonists to slowly turning into what they feared. Both manga also deploys a society in decadence and some surreal subjects. Also, there is a strange sect involved with protagonists in both series. But Ana Satsujin heavily drops in quality during the last arc though.