'Read It All at Once!' - YouTube Video Released for 'Rainbow Island with Letters: Diamond Edition'
Gakken Co., Ltd. has released a YouTube video featuring parent-child monitors for the children's book 'Rainbow Island with Letters: Diamond Edition.' The video showcases how the series' layered storytelling with six protagonists and physical gimmicks like actual letters foster children's continuous motivation to read.
📋 Article Processing Timeline
- 📰 Published: May 25, 2026 at 21:00
- 🔍 Collected: May 25, 2026 at 12:31
- 🤖 AI Analyzed: May 27, 2026 at 02:01 (37h 29m after Collected)
Gakken Co., Ltd., a group company of Gakken Holdings Co., Ltd., released an introductory video for 'Rainbow Island with Letters: Diamond Edition' on YouTube on May 12, 2026. The video captures the genuine reactions of parent-child monitors to showcase the unique appeal of the series.
With comments like 'I read it all at once!' and 'I'm curious about the other characters' stories!', the series has proven to be highly engaging. In the monitor project conducted in autumn 2025, children who read Volume 4, 'Secret Present,' immediately expressed a desire to read more. A key reason for this is the series structure, where all six main characters appear throughout all volumes. By switching perspectives in each book, the same daily events are seen in a new light. This makes it easy to start from any volume, with the connections between characters deepening as the reader progresses.
Set in 'Unicorn Academy,' a magical boarding school on 'Rainbow Island,' the story follows students as they bond with their unicorn partners and navigate friendship, misunderstandings, anxiety, and courage. It incorporates themes such as 'social distance with friends' and 'finding one's true self'—topics that resonate deeply with elementary school children. Parents have also praised the series, noting that it provides hints for navigating social interactions.
Furthermore, the series includes interactive elements such as personality check pages to compare readers with characters, actual 'letters' from the protagonists, and letter sets for replies. These features provide an immersive experience, making readers feel as if they have stepped into the story's world.
While each volume is a standalone story, 'Rainbow Island with Letters: Diamond Edition' naturally encourages a continuous reading habit. As the latest series in the 'With Letters' brand, which celebrates its 12th anniversary since starting in 2014, it continues to bring excitement to children everywhere.
With comments like 'I read it all at once!' and 'I'm curious about the other characters' stories!', the series has proven to be highly engaging. In the monitor project conducted in autumn 2025, children who read Volume 4, 'Secret Present,' immediately expressed a desire to read more. A key reason for this is the series structure, where all six main characters appear throughout all volumes. By switching perspectives in each book, the same daily events are seen in a new light. This makes it easy to start from any volume, with the connections between characters deepening as the reader progresses.
Set in 'Unicorn Academy,' a magical boarding school on 'Rainbow Island,' the story follows students as they bond with their unicorn partners and navigate friendship, misunderstandings, anxiety, and courage. It incorporates themes such as 'social distance with friends' and 'finding one's true self'—topics that resonate deeply with elementary school children. Parents have also praised the series, noting that it provides hints for navigating social interactions.
Furthermore, the series includes interactive elements such as personality check pages to compare readers with characters, actual 'letters' from the protagonists, and letter sets for replies. These features provide an immersive experience, making readers feel as if they have stepped into the story's world.
While each volume is a standalone story, 'Rainbow Island with Letters: Diamond Edition' naturally encourages a continuous reading habit. As the latest series in the 'With Letters' brand, which celebrates its 12th anniversary since starting in 2014, it continues to bring excitement to children everywhere.
FAQ
『虹の島のお手紙つき ダイヤモンド編』の動画公開日はいつですか？
2026年5月12日にYouTubeにて公開されました。
このシリーズが子供たちを夢中にさせる理由は何ですか？
6人の主人公が全巻に登場し、巻ごとに視点が切り替わる構成により、読み進めるほど登場人物のつながりが深まる点や、主人公から届く本物の「お手紙」が封入されている体験型の仕掛けが理由です。
今回のモニター動画では、具体的にどの巻が体験されましたか？
シリーズ第4巻の『ひみつのプレゼント』が体験されました。
物語の舞台やテーマはどのようなものですか？
“虹の島”にある全寮制の魔法の学園「ユニコーン・アカデミー」を舞台に、友情、すれ違い、自信、自分らしさといった、小学生が直面しやすいテーマを扱っています。
「お手紙つき」シリーズの歴史について教えてください。
2014年にスタートした児童読み物シリーズで、2026年時点で誕生12周年を迎えています。