One day, Noby's mother need to return a golf bag that she borrowed it from a friend. Noby offerd to carry the heavy golf bag because he had a bad news that he had failed the history test.
He had it on his back and left for the possessor's house, but the golf bag was too heavy for him to carry. Noby asked Doraemon to help him. Doraemon took out "The Black Hole Pen and The White Hole Pen". If people draw a circle with the block hole pen, anything is swallowed up in the circle like black hole. If people draw a circle with the white pen, it push objects out like white hole. Noby tried them and was able to deliver the golf bag in a moment.