Light Novel Volume 13

Issei SOS is the upcoming thirteenth novel of the High School DxD series. It is the first novel of the Legend of Oppai Dragon and his Lively Companions arc, and is the second short story collection in the series, after Volume 8.

There are two editions of the novel set to be published: a limited edition (set for release on September 6, 2012) which features an OVA 13th episode of the High School DxD anime on Blu-ray disc, and a regular edition (set for release on September 20, 2012) which lacks the episode. The OVA will be written by Ichiei Ishibumi, the author of the light novels, himself.