Dr. Slump and Arale-chan: Hoyoyo!! Follow the Rescued Shark...
Dr. Slump: Arale-chan - Hoyoyo!! Tasuketa Same ni Tsurerarete... · Dr.スランプ アラレちゃん ほよよ!!助けたサメに連れられて...
Synopsis
Arale saves a baby shark at the beach and in gratitude the sharks invite she and her family to visit the Underwater Kingdom. (Source: Anime News Network)
Studios: Toei Animation
Source: MANGA