一座在雲層之中的小島，四季都下著雨。由於酸雨和環境變遷， 神獸們的棲息地湖泊遭受破壞，身上的異色青苔不斷生長，逐漸限制了自由，也吞噬了他們的靈魂。唯有豚豚察覺到異色青苔的危害，在某次潛入湖中，發現了另一個未受污染的潔淨世界 ，在那裡與櫻桃鴨相遇，攜手尋找具有療效的神秘果實。
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On a cloud island, where it rains constantly, the homes of magical creatures have been ruined due to acid rain and environmental changes. Different-colored moss continues to grow, overtaking their habitats and limiting their freedom. Only TouTou recognizes the danger posed by this moss. It dives into a lake and discovers a pristine, untouched world. There, it meets a cherry duck, and together they search for a special healing fruit.
