On a very small overcrowded island live the Miniminimus. Half-animal, half-plant, they are born from the seeds of trees. To compensate for the lack of space, everything about them is miniature: the houses, the furniture, the objects... The entire society, which advocates restriction, admires and honors those who take up the least space. One day, a group that has become too cumbersome must leave the island. The adventure leads them to the Maximaximus, their exact opposite. But do happiness and peace reside in grandeur and abundance?