Here's an explanation for the story if you didnt understand! (Tbh it would be confusing if you dont know about the song) Basically, this is about Aquarius wanting to commit suicide over and over again with different reasons on a different time. All of the characters, except for the one at the very end (thats capricorn), is the past versions of himself. He keeps saving himself, convincing himself to not commit suicide until finally he is unable to convince himself and goes to the rooftop once more, but this time someone else is there to help him
THIS LOOKS GODLY! So the reason why Aqua wears the mask is because he got a scar on his mouth? I don't really understand all that happened here, but it was some very beautiful art