Space Heroes, the constellation heroes who protect the peaceful nights on earth are very popular among children! However, Rihito's favorite hero, Scorpio, is not so popular and he wants everyone to know how cool Scorpio is. One day Rihito receives an invitation to the Hero Festival. Let's go meet the heroes with Rihito! What are constellations? How many constellations are there? And what is the first-magnitude star? Space Heroes will answer all the questions in the planetarium.