One Piece manga has been ongoing for many years. It's hard to give an exact length as new chapters are still being released, but it's an extensive and epic story.
I'm not sure which specific 'long nose man story' you are referring to. There could be many fictional or cultural stories about a man with a long nose. It could be something like Pinocchio, whose nose grew longer when he told lies.
Well, without more context, it's difficult to tell the 'long nose boy story'. However, it could potentially be a story about a boy who is teased because of his long nose, but then he discovers that his long nose is actually an advantage. For example, he might use it to reach things that others can't or to perform some unique task in a circus or in a magical adventure.
If the long nose boy overcomes difficulties related to his long nose, the moral could be about self - acceptance. Accepting what makes you different can lead to great things.
A possible plot could be that the guy with a big nose is in love with a girl who doesn't seem to notice him at first because of his appearance. But as she gets to know him better, she realizes his kind heart and his big nose becomes something she loves about him as it represents his uniqueness.
The long nose of Pinocchio in the story is a symbol of his lying. Every time he tells a lie, his nose grows longer. It serves as a moral lesson for children, teaching them that lying has consequences.
One possible theme could be acceptance. The boy's long nose makes him different, and the story might be about how others come to accept him for who he is.