This show has an incredible concept, and it uses it well. It's cute and fun and is a treat to watch.

If you want to watch this for the BL, I'm sorry but there isn't much. The relationship between the characters is mostly friendship and the plot mostly focuses on the colour blindness. However, the friendship is sweet.

Pros:
The character motives are clear and everything happens for a reason.
It's a short, simple plot that is heartwarming and sweet.
The friendship is sweet

Cons:
The pacing was very off. I think this is because of the episode length, but either something was too rushed or happened too soon.
Some elements feel unrealistic - you'll understand when you watch it.