>>281548689
Neko decided the best place to drop the fact that Chitose and Nayuta are half-sisters in a special booklet...
>Theory
Yeah, he could just prefer how the anime colours look and is going for a half and half between anime and manga colours. The hair, I would say either he likes his choices better or its because he wrote and said the colours years ago so can't go back on it unlike the uniforms where there's a bit of leeway.