ASCII Media Works has published eight volumes in the series since September 2010.

The chapters were collected in ten volumes published by ASCII Media Works.

ASCII Media Works has published eight volumes since February 2011.

A compilation was released on September 30, 2010 by ASCII Media Works.

ASCII Media Works reported that as of November 2009, over 3.5 million copies of the first twelve novels have been sold.

The chapters were also published in 15 tankōbon volumes by ASCII Media Works.

ASCII Media Works has published 11 volumes since January 2010, and one more novel is planned.

Four bound volumes were released by ASCII Media Works.

The game's official fan book was released on March 19, 2009 published by ASCII Media Works.

Two manga adaptations have been published by ASCII Media Works.

ASCII Media Works has published eight volumes in the series since September 2010.

The chapters were collected in ten volumes published by ASCII Media Works.

ASCII Media Works has published eight volumes since February 2011.

A compilation was released on September 30, 2010 by ASCII Media Works.

ASCII Media Works reported that as of November 2009, over 3.5 million copies of the first twelve novels have been sold.

The chapters were also published in 15 tankōbon volumes by ASCII Media Works.

ASCII Media Works has published 11 volumes since January 2010, and one more novel is planned.

Four bound volumes were released by ASCII Media Works.

The game's official fan book was released on March 19, 2009 published by ASCII Media Works.

Two manga adaptations have been published by ASCII Media Works.