
Quick answer — "Utaeba Soko ni Kimi ga Iru kara" by Konomi Suzuki is the opening theme of LOST SONG.
"Utaeba Soko ni Kimi ga Iru kara" by Konomi Suzuki is the opening theme of LOST SONG.
"Utaeba Soko ni Kimi ga Iru kara" is performed by Konomi Suzuki.