Mantis Parable

In the story, a caterpillar was captured and shut into a bottle by a man.
It wanted to go out, but he couldn't.
A mantis came there, and the caterpillar asked him for help.
However, the mantis didn't.
The man came here and captured and shut it into a bottle.
It regretted not helping the caterpillar.
Then a butterfly which was the caterpillar came with its friend flies, and help the mantis.
After I watched the scene, I was moved.
I think the theme of story is how important mutual help is.