At Gateway City, a huge city in the Demon Realm occupied by the Humans, Hero, addressing himself as Black Knight, saves a Demon barmaid from being harassed from Crusaders and learns from her how most of the Human army have mistreated the Demons since occupying the city except those who guard the Eastern Fortress. Meanwhile, the expeditionary fleet sent to recapture Aurora Island is a disaster no thanks to their incompetent commander the White Night King when Demon Krakens destroy most of the fleet with only a few survivors, including the Winter Prince, whose father is killed saving the White Night King. Back in the Southern Nations, most of the Southern leaders are disgusted with White Night King, who refuses to take responsibility for his failures and tries to blame it on the late Winter King. Viewed with distrust by White Night King due to Crimson Scholar, the Church and the Alliance helping the Winter Kingdom, the Winter Prince assumes his father's throne, becoming the new Winter King and summons Female Knight to command a second expedition to recapture Aurora Island. As Female Knight prepares to depart, Scholar confesses her true identity to her and wants to be her friend. To her surprise, Female Knight already knew since Hero told her the truth before and accepts the Queen's friendship. The New Year Festival arrives and after one year apart, Hero and Demon Queen finally reunite. After the two have a dance by themselves, Hero reveals to her that he has a plan to liberate Gateway City in one month and learns from her that she also intends to help the Humans retake Aurora Island. Hero then leaves again, promising to meet her next time in the battlefield.
南部諸王国では、魔族に奪われた極光島奪還のための戦争の機運が高まっていた。そのような中、女騎士は子弟トリオを猛特訓する。一方、人間が奪った魔界の町・開門都市をおとずれた勇者は、聖鍵遠征軍の駐留部隊の現状を知ることとなる。丘の向こうへ続く道のために、勇者は行動を決意した！
인간에 의해 점령당한 마을에서 벌어지는 마족들의 횡포를 목격한 용사는
이 전쟁이 가져온 현실 그리고 벌어지게 될 일에 대해 다시 한번 실감하게 된다.
한편 인간진영은 빼앗긴 극광도를 되찾기 위해 대규모 부대를 해로로 진출시키는데...
En Gateway City, una gran ciudad en el Reino Demonio ocupado por los Humanos, Hero, que se llama a sí mismo como Caballero Negro, salva a una camarera Demon de ser acosada por los cruzados y aprende de ella cómo la mayoría del ejército humano ha maltratado a los demonios desde que ocuparon ciudad excepto aquellos que custodian la Fortaleza Oriental.
