The evil Kisaragi Corporation's spy, Agent Six, has successfully integrated into one of the Kingdom of Grace's commando units! While his approach to heroics is...unconventional, his combination of modern weaponry, outside-the-box thinking, and ruthlessness has made his squad of misfits into one of the kingdom's greatest assets in the fight against the Demon Lord. This time, it's up to him, Alice, Snow, Rose, and Grimm to capture the impregnable Tower of Duster and face off against Heine of the Flames once more in an all-out battle...