When people select their favorite characters on their smartphones, and swipe them towards the water screen, the worlds that those characters embody will appear, influencing one another to create a single world.
The elements that are born from the characters are placed at various positions within the space, and the physical influences and connections between them produce a single world. For example, when the wind blows, flowers and snow physically fly away. Birds alight in trees, and butterflies are attracted to flowers. Just as in nature, what you see at this moment can never be seen again.