Eyes

"He had eyes to see the beauty of the world, but didn't know how to appreciate it."
This is septicpie, or Jelix...IDK WHAT ITS CALLED.
It's basically about Jack (or anti in this case) slowly falling into depression because of a mental disorder he has, he sees unnatural demons and stuff (not a real disorder, probably similar to one). Felix is looking after him and making sure he doesn't kill himself whenever he gets the chance. That's why it's called eyes: he could see all the amazing things in life, but his disorder ruins it.