Volume 4 Special (Light Novel): Lumiess Revisits Japan
4巻特典 ルミエスの再訪日
This is from this is from Minoru and Kumi-chan’s blog and (presumably) not the final product.
Also, I said last time that any subsequent extras would be labeled as 90.6, 90.7, etc., but this was unexpectedly from a previous volume, so… yeah, I’m just ruining the numbering system even more… ;-;