https://doujinshi.wiki/book/1299190
https://www.suruga-ya.jp/product/detail/ZHORE116193

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A collection of congratulatory messages and arts for the Saki Zenkoku-hen anime from various staff members, voice actors and artists in the industry. The book is listed as 64 pages everywhere, but it's actually 56 pages in total. The contents page shows every art included in the book and there is no indication of any missing pages.