一个是因溺水而只能看到水纹形状世界的女孩玛丽， 一个是被嘲笑为胆小鬼，不敢下水游泳的男孩蘑菇，因为爱与勇气，一起创造了一个属于他们的童话世界。 青梅竹马般的两人，在童年里，都等待到了自己的多啦a梦。

It is a fairy tale story. Because of love and courage, a girl who can only see the world as if in the water after getting drown called Mary met a boy named Mogu who is afraid of swimming. And both of them ended up getting their Doraemon.