@monkey123 because more people like it than the few that don’t. One person disliking it because it is boring isn’t going to change the rating by any huge amount.
Like many fluffy heartwarming manga with subtle comedy, it is a break from the overused shonen tropes. Personally, stuff like these triggers parental instincts making it much more enjoyable to read
That said though, no need for face masks, unless you're feeling unwell. Even then, it's better to just stay at home if you're sick. Helps limit the spread.
If demon king wants to conquer the world, he should send his daughter over to meer the human king and have her say "pwease join my papa's countwy".
There. World conquered.
If this was a d&d session and an player playing an angel would react like that in my game I would take his sheet and replace lawful good with chaotic good because there's no way he could be sure that wasn't just a human toddler.