 If you liked Mirai Nikki |  ...then you might like ChäoS;HEAd |
Male lead that doesn't talk to anyone? Check. Mysterious weird girl who joins with the main lead? Check Murder? Check Blood? Check. Yep, the elements are all here.
report Recommended by titanguy654
Both stories revolve around a shy boy who keeps to himself quite often meeting up with a lethal girl with pink hair as well as a massive conspiracy regarding the events of to what is really happening as time goes by.
report Recommended by Disapeared_Ghost