Licht and the gang come face-to-face with the deadly demon of the abyss-a modern-day military weapon of steel unlike anything they've seen before. Trapped by giant, weighty wings of metal and indiscriminate attacks from the sky, the fate of the town rests in the hands of the Ace of Flashing Strikes himself But just as Licht prepares to subdue the destructive enemy, he's greeted by a familiar face-a black-haired, trigger-happy soldier who's also...an Ace?