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about this song
"Lost in Blue" is a song released by NIGHTMARE as the title track to their 13th single, "Lost in Blue". The song was used as the opening theme for the anime "Mōryō no Hako". The song's theme is "the end of summer". RUKA, who wrote the lyrics, has said that he tends to get negative when drinking alone, and that these lyrics were written during one of those moments. When preparing for the anime tie-in, RUKA intended to read the original manga to write the lyrics