Boogiepop wa Warawanai, Shinsekai yori Recommendations
The settings and plots are extremely different between these two anime, but if you enjoyed the unique vibe of Boogiepop Phantom, you should thoroughly enjoy the artistry and individuality of From the New World. The theme of things-are-not-always-as-they-seem is also carried over.
Both boogiepop phantom and from the new world have two abuse and explicit violence theme
BP (Boogiepop phantom) is animal abuse and physical abuse
SSY/FTNW (shinsekai yori/from the new world) is physical abuse