This OP is just so addictive. I’ve been putting it on repeat for entire days now. You don’t see many anime OPs without a vocal out there. Plus, the music fits really well with the series. It’s kinda eerie, but also upbeat; a bit sad, but also inspiring. A good welcome for anyone wanting to take on the anime series.
The OP also presents a powerful message. It signifies the bizarre world our characters have been living in. In our “normal” world, they are nothing but black-and-white figures covered in blood. On the other hand, they are perfectly at home with another world in ruin, where there are no ones but their own. I can never forget that scene with Kotori’s bloody smile while other girls her age run around happily together. Since I’ve read the manga before watching this, it just makes a lot of sense to me.
Overall, enjoy 🙂