People be arguing that life is fair and all but there are lives that are straight up unfortunate. Kazou’s eyes were severely damaged to the point that they couldn’t be saved when he was a kitten.
However, the ordeal did not stop him from thriving. Kazou is now a proud, sassy cat. Even when he’s unable to see, his sharp senses allow him to feel his surrounding and, of course, do cat stuffs like chasing things and being overly playful. Maybe we could learn a thing or two from animals if we look hard enough.