A really famous one, this one i think you all have seen it but let's still make it discover to those that don't know it haha.
Story is pretty easy to understand not a lot of personnage (2) easy series of action. The little sad about this is that in the reality this don't happen like that, even after saving the "angel" the little "demon" would have been pushed down and keep falling. It could happen in some case that the "angel" is really thankful to the "demon" but in the current society this isn't the leading trend. The leading trend (because it's the way society is made) is to taken what is available to take and never give. But in fact if everyone gave back when you help them it would mean you helped them to get in return and this might not seem good too.
I think it's better society were everyone give and get back than no one give and no give back. Therefor when possible i always try to be as helpful as i can even with shitty people that just gonna be rude in return. Be good for you, not for others.