Shimajiro and his friends were at the park with Dr. Roarson observing the Milky Way and enjoying spotting a shooting star in the star-filled sky, when they come across a comet fairy named Sese who asks for their help. Her twin brother Susu is stuck in an asteroid and is in trouble. Comets are important beings that show us shooting stars. If this situation continues, they will not be able to see the shooting star. Can the Shimajiro save Susu and make a wish on the shooting star?