一個是因溺水而只能看到水紋形狀世界的女孩瑪麗, 一個是被嘲笑為膽小鬼,不敢下水游泳的男孩蘑菇,因為愛與勇氣,一起創造了一個屬於他們的童話世界。 青梅竹馬般的兩人,在童年裡,都等待到了自己的多啦a夢。 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.