Works used as references in previous Act

Evangelion

Naruto

One Piece

Bleach

Bludgeoning angel Dokuro-chan

Prince of tennis

JoJo's Adventures 

5 centimeters per second 

Full-metal jacket 

Clockwork Orange 

Terminator 2

Maho Shojo Madoka Magica

Spice and Wolf

Death Note

Pokemon

300

Lucky Star

Plus some social and cultural phenomenons from real life