Brunhild the Dragonslayer, Vol. 3 (manga)

Thanks to Brunhild's heroic efforts, the group of dragons that suddenly attacked the Norvelland Empire's capital, Nibelungen, is somehow driven back—but not before the city suffers heavy losses. Brunhild herself is gravely injured during the battle, and a worried Sigurd pays her a visit. There, Brunhild reveals the unimaginable truth behind the hellish assault…

Volume 3 of the Brunhild the Dragonslayer manga series by Aoaso Aoaso.