For me it's Boku Dake ga Inai Machi/Erased's OP.
Samurai Flamenco's second opening.
I like a lot of Yozuca's stuff but most of it happens to be in Girls Bravo.
The openings and endings in the second season of Ajin. Like the ones in the first season were PERFECT! Why change them!? D:
Tokyo Ghoul's opening!
Eureka 7 and Code Geass
Intro to angel beats