the after night

in this world its normal until night, there are these things called "watchers" they look like a human around the ages of 10 to 18 and they have blue skin and yellow eyes and black hair and wings and they come out at night and dont look at them in the eyes or they will slowly get angrier until they grab you and drag you somewhere and all thats known is that every person who got grab never came back and there was a new one right after that and you and your friends are just chillimg at the park like normal