Mio Isayama / Letter (Single Version) "Letter" is a song that any Mio Isayama fan would know. It has been recorded five times and is a standard song for her, always performed on stage. Each time it's released in a different form, the fans who are touched by "Letter" at that time have steadily increased. Furthermore, after the "Letter" included in the compilation album "Issho ni Utao! CBC Radio" released in May of this year by Nagoya CBC Radio, there was a surge of requests for a single release from users who listened to it, as well as inquiries from listeners who didn't know "Letter" yet, leading to the decision to finally release it as a single. Welcoming talented creators (producer Hidekazu Uchiike and arranger Satoshi Togawa), the new version of "Letter," which has been rearranged to be more grand and dramatic, will finally reach the entire country.