Have you seen Boku Dake Ga Inai Machi (Erased)? I just finished it and I'm in a pool of my own tears. It messed me up, man.
It's suspenseful. Dark. But also really sweet. It's not super similar to Toradora and Your Lie in April, but they were spot on with those emotional twists and turns.
asian kungfu generation slays me
All seem like possibilities you may enjoy.
Favorite anime list at http://www.anime-planet.com/users/Reddawnrocker/anime/...