• Book Name: Yesterday wo Utatte EX – Genten wo Tazurete Toume Kei Shoki Tanpenshuu Manga
• Alternative(s): Sing "Yesterday" for Me EX; Sing Yesterday for Me EX; The Sea Where the Siren Lives; Yesterday wo Utatte EX; イエスタデイをうたってEX ～原点を訪ねて 冬目景 初期短編集～; サイレンの棲む海
• Author(s): Toume Kei
• Status: Completed Download Manga
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Summary: A special volume containing background/design information on the main series, some extra side stories, as well as some early works by Kei Toume. The Sea Where the Siren Lives: "In the city by the sea, we understood that we could never understand each other."