It drops you at street level and makes you crane your neck at the giant robot like everybody else in town. Lily Bridge is the whole trick: a rookie reporter chasing a scoop through Arkham City, where the eldritch weirdness is so routine that only Demonbane itself still counts as news. That one scrap of Hadou Combine machinery is the thread, and pulling it drags her out of journalism and into Lovecraft's filing cabinet, where the grimoires are alive and the mecha runs on them. Twenty-odd minutes is a criminally short leash for a Nitroplus cosmology this dense, and yes, it sprints. But Kurou and Al Azif summoning Demonbane over a city named Arkham, seen through the eyes of somebody who just wanted a byline, hits harder than any straight adaptation would have. Watch it for the reporter, stay for the tentacles.

Journalist Lily Bridge comes to Arkham City hoping for a big scoop, but strange events are so common there that only the most unusual finds make the news, such as the mysterious mecha called Demonbane. When she comes across a small piece of machinery that appears linked to the Hadou Combine, she sets out to learn the truth. Her search draws her into a dark world tied to Demonbane and the powerful forces that rule the city. The single-episode OVA blends mecha action and science fiction with drama and comedy, and it adapts the Nitroplus visual novel Zanmataisei Demonbane.