Three girls named Hjh Bibi, Rashidah, and Hjh Mazrah loved chocolate and heard a story about a treasure of chocolate at the end of a rainbow guarded by a dragon. While following a rainbow they saw, they realized the rainbow was impossible to reach. Later, using a torch in an empty house, Hjh Bibi discovered that the rainbow was caused by the reflection and refraction of light through water, not a real treasure at the end. They learned rainbows are an optical illusion.