Rokkenjima Investigation File (六軒島捜査ファイル Rokkenjima Sōsa Fairu) is an Umineko When They Cry art booklet that was released at the el segundo Dorado fan event on May 22, 2011. It contains rough sketches for various characters and previews of Higanbana no Saku Yoru ni character designs, among other things.
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.png "Rokkenjima investigation file page (1).png (2.33 MB)")
Professor Ootsuki sending materials to an unknown person.
.png "Rokkenjima investigation file page (2).png (4.23 MB)")
.png "Rokkenjima investigation file page (3).png (3.66 MB)")
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Unused Chiester Sister artwork
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Concept art for Dlanor A. Knox and Cornelia
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.png "Rokkenjima investigation file page (7).png (3.51 MB)")
Note from Ryukishi07
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Teaser of Higanbana backgrounds
.png "Rokkenjima investigation file page (9).png (3.68 MB)")
Concept art for Marie Moriya and Higanbana