The unhinged Commander of Tenrou Nation, Kyoukotsu, has laid siege to Shiranui Fortress. Hinowa and friends are on high alert, determined to hold the fortress no matter what comes their way. But what Kyoukotsu schemes is beyond their comprehension, and it will take all their combined efforts to impede the infamous Commander. Meanwhile, plans are stirring in the Tenrou Nation, and an unexpected face makes an appearance...