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The goal of this project is to establish the proper continuity of single timeline where all media can share same material despite different continuity and series. The first episode to be consider to be part of Project Isla is Death of Lady Rema Yoshimizu and later Afterlife Expanding and Touhou Galaxy Project's Reisen Naka series.
All known material that appear all series are including character Luna Eventyr, Tamura Hon and Princess Shidori. The location such as Grand Kunstlerina Academy, Burand Diamond, etc.