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if you just need to rip the cg, or whatever pict from ao no kanata game, then try this, i used to extract bmp file from previous sprite/fairys game imaimo, its works fine...
i think its compatible with ao no kanata since they came from the same developer with the same game engine, just use sysgrp converter to rip the bmp file, but you need tools like ae vn tools or galcrass to unpack the archive first
https://github.com/xupefei/BGIKit