Responses
From the way they are coloured I think it’s just stylistic choice. The colour seems to change depending on the lighting/mood. But it’s always a gradient to black. So probably it’s just a minuscule detail for more expression.
This is not a spoiler
I'm still on chapter 45 but the rabbit that's on the cover, his eyes keep changing colors it was green then became blue then orange like what it has nothing to do with the storyline but ye.?