Umika is a sweet yet shy high school girl. She has trouble speaking to others and dreams of having a friend from another planet. But her lonely school life takes a cosmic turn when she meets transfer student Yu, an alien with telepathic powers! The two become close and promise to go to space one day. So, they decide to build a rocket and shoot for the stars, making new friends along the way.

Touko often watches a hallucination in the glitters. In her last summer holidays of a school, Kakeru who is strange transfer student appears before her and her friends. Kakeru tells Touko that he often hears "voice from future".