Dr. Slump: Arale's Surprise Bang

Original title: ドクタースランプ　アラレのびっくりバーン

Arale and company arrive at a nice location for a picnic. They soon discover a beautiful stone with strange powers. Before they know it, a dangerous pirate and his mysterious ship invades their peace and steals the stone. Now it is up to them to retrieve the stone before it is used by evil hands.