Depends what you consider to be mainstream. Shin Sekai Yori is awesome, but might be mainstream enough? Depends if you mean mainstream among normies or mainstream among people who watch a lot of anime.
If you mean the latter, I enjoyed Tsukuyomi Moon Phase recently. The vast majority probably won't really like it, but I went in with sub zero expectations and the atmosphere it created was something I liked to the point where it's gotten me to read the manga, so that's gotta be worth something.
Depends what you consider to be mainstream. Shin Sekai Yori is awesome, but might be mainstream enough? Depends if you mean mainstream among normies or mainstream among people who watch a lot of anime.
If you mean the latter, I enjoyed Tsukuyomi Moon Phase recently. The vast majority probably won't really like it, but I went in with sub zero expectations and the atmosphere it created was something I liked to the point where it's gotten me to read the manga, so that's gotta be worth something.
I would also recommend Shin Sekai Yori.