Adventure on the Gaboten Island, or Bouken Gabotenjima, from TCJ, is a black and white adventure anime that ran for 39 episodes. Multiple manga adaptations were produced after the anime's completion.
Five children sneaking into a theme park at night I understand. All running into each other on a submarine ride makes sense. The submarine being fully functional and breaking off the track chains so easily makes these kids ending on on a deserted island the best case scenario for the amusement park company. Said island being a miniature filmed for parts of the opening is charming.
Th island backgrounds, even in grayscale, are appealing, and the cast is designed to easily present the archetypes of our core cast- leader, rival, smart, fat, and girl. This is a common group design we will see again throughout time, so it's interesting to see this early iteration.
