Once upon a time, there was a girl name Ruby who stay near the river. Her job is to collect rubbish. She always cleans the river and make sure the fishes stay safe. 

One day, she saw the river is full of rubbish. She become a bit frustrated but still collected the rubbish. 

The next day, she saw the cans again and decided to find out who did this. So, she hide herself behind the tree. 

After a while, she saw a boy who came near to the river and keep throwing the rubbish to the river.