It was about the things you think are impossible are still possible. The things you think will never happen like seeing your father on the moon may not be real but having a dream and following through on that dream and never giving up is more important than the truth.
And in a way his dad was on the moon through the love of his son
not my favorite fujimoto work, seems a little silly but the message was clear. Supposed to be that no dream is ever impossible if you believe in yourself. But what a weird way to portray that lol