Synopsis

A romantic drama based on the novel of the same name by Kawamura Genki.

Psychiatrist Fujishiro Shun (Sato Takeru), receives a letter out of the blue from Iyoda Haru (Mori Nana), his former college lover from 10 years prior. The letter, sent from Salar de Uyuni in Bolivia (known as Mirror of the Sky), shared memories of their first love from 10 years ago. After that, Haru continues to send letters from various places around the world, including Prague and Iceland. Meanwhile, Fujishiro is preparing for his upcoming marriage to his current girlfriend, Sakamoto Yayoi (Nagasawa Masami), but one day, she suddenly disappears without a trace. Why did Haru start sending letters, and where did Yayoi disappear to? As Fujishiro starts searching for her, these two mysteries eventually become intertwined.