Dr. Slump found the secret treasure named “Eye of Rainbow” of legendary Nanaba Castle in the mountain. This treasure makes every dream come true. When the robbery gang of Arale, Ga-chan tried to steal this treasure, Bisna who is the descendant of Nanaba Kingdom took the treasure. Bisna wanted to revive the devil and Nanaba Kingdom. Arale and her friends went towards the secret Nanaba Castle to get back the treasure.
(Source: Official Website)
Japanese:
Dr.スランプ アラレちゃん ほよよ!ナナバ城の秘宝
Synonyms:
Dr. Slump & Arale-chan HoYoYo! The Treasure of Nanaba Castle, Dr. Slump: Arale-chan Hoyoyo! Nanabajou no Hihou
online, or you can even watch Dr. Slump and Arale-chan Movie 04: Hoyoyo! The Treasure of Nanaba Castle DUB in HD
quality.
You can also find
anime on AniWatch website.