Recap of the first 6 episodes of Youjo Senki
In the ruined house, a member of the rock band breaks a seal to shut Melon the witch. And then Melon murders the members of the band one after another.
The time is UC 1926. The Imperial Army's 203rd Air Mage Battalion led by Major Tanya Degurechaff has won the battle to the south against the Republic's stragglers. They expected to be given a vacation after returning victorious, but instead receive special orders from Staff HQ as soon as they get home. They are told that there were signs of a large-scale deployment near the Empire-Federation border.