On the white snowy ice field of Hokkaido, stands a lonely planetarium. This is the place where the little girl Caiyue, her mentally handicapped brother Daihui, and her childhood friend Sata often play. They look up at the starry sky and fantasize about their mother who lives tens of thousands of light years away. Until one day, Sata's family moved to Canada. Although he communicated with his friends during this period, he gradually lost contact. 11 years have passed in a blink of an eye. 19-year-old Caiyue (played by Toda Erika) works in a construction company. Her father has passed away long ago. She and Daihui (played by Wakaba Ryuya) enjoy a lonely and ordinary life. One day, Sata (played by Kato Kazuki) reappeared in front of her. Although they resented that Sata had lost contact, the three friends soon restored their childhood friendship. However, this reunion was fleeting like a meteor... The film is based on the original work "Kimi ni Hikari" by cartoonist Mitsuyaomi, and is the first directorial work of female photographer Amiy Mori.