The main characters were Margot and William but there were also other students involved. Margot is from Earth but she moved to Venus. This is what makes her unique from the other students. She missed the Earth and Sun because of the constant rain on Venus.
Margot just doesn't fit in with the rest of the students. None of the children remember seeing the sun come out but Margot did. They were from Venus and she was from Earth. The children just did not share the same similarities as Margot.
The children are excited about seeing the sun. None of them remember the Sun but Margot. She had came from Earth where she had seen Sun before unlike the other students who haven't because it had been raining on Venus for seven years.
Yeah we really are
The rain had began to stop and the sun was about to rise. The students locked Margot in the closet forgetting all about the little girl. They go outside and enjoy the sun that they haven't seen in seven years.
How am I going to get out?
I missed the Sun arise
Margot is still stuck in the closet. Knowing that she's missing the only chance to see the sun for the next seven years. All the children are still enjoying the beautiful bright sun until they feel a droplet of rain hit them.
The children then head back underground. One of the children remember that Margot was still in the closet. The children realized their cruelty and released Margot from the closet.