Log Horizon, Vol. 10 (light novel)

Almost a full year has passed since Shiroe and the others found themselves stuck in Elder Tales. Most of the Akiba residents have grown accustomed to the new world--though, they still don't want to be there. Minori delivers Shiroe a letter from Roe2, his sub-character from the test server. He suspects she's someone who might be able to explain exactly why the Catastrophe happened and for what purpose.

Volume 10 of the Log Horizon light novel series by Kazuhiro Hara.