 If you liked
Digimon Adventure
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 ...then you might like
Mujin Wakusei Survive
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Both feature children stranded on islands, surviving on their own (shaky) merits and aided by strange creatures. Although Survive is more mature and realistic than Digimon 01, both have the same strong friendship themes and slow character development. On the other hand, Survive lacks battles and power-ups, so if your interest from the Digimon side is in that (or, coming from the Survive side, you can't stand that), avoid. Otherwise these two are really two titles that just fit.