There are a total of 12 light novels. The first chapter was published December the 21st, 2010. It released its final chapter on January the 25th, 2019.
Light Novel vol. 1 Cover
Light Novel vol. 2 Cover
Light Novel vol. 3 Cover
Light Novel vol. 4 Cover
Light Novel vol. 5 Cover
Light Novel vol. 6 Cover
Light Novel vol. 10 Cover
Light Novel vol. 11 Cover
Light Novel vol. 12 Cover