If you're looking for anime similar to Kishin Houkou Demonbane: Super Comic Gekijou, you might like these titles.
A story of the bonds between those who fight, in a world pushed to its limits. On one of the countless parallel worlds that exist throughout spacetime, humanity has fought a decades long war against the BETA, hostile extraterrestrial invaders, using humanoid fighting machines called Tactical Surface Fighters. This is a story of how humanity lives and dies while on the brink of extinction…
Amidst the hustle and bustle of Arkham, a wonderous city built by the powers of magic and alchemy, lie not-so-hushed rumors of a great machine that can be rarely seen in the city. With the newest sighting of this towering robot known as Demonbane, freelance journalist Lily Bridge is on the road to employment with a local paper. Her task? Find out information about the Demonbane by whatever means necessary! Joined by Kuro Daijuji, private investigator, Lily's skills are put to the test when mad scientists, otherworldly women, and even Demonbane itself gets in the way!
The second episode of the "Triangle Hearts ~Sweet Songs Forever~ Sound Stage VA" video collection based on Triangle Hearts 3.
Unaired episode included in the 1st and 5th DVD volume release of Demonbane.
The year is 1973 when the BETA, a race of aliens discovered on the moon, first arrive on Earth and begin their systematic extermination of the human race. Mankind's only hope lies with Tactical Surface Fighters, or TSFs, piloted by both military elite and would-be trainees such as Yui Takamura, a young girl descended from a long line of Imperial Guards. Alongside other amateurs, she finds herself on the front lines of a final defense against the bloodthirsty monsters, unaware of the brutal consequence that awaits them. Three years later, Yuuya Bridges, a half-Japanese, half-American pilot, is assigned to an elite United Nations squadron tasked with developing new TSFs to beat back the alien forces. As humanity struggles to survive, Yuuya must come to terms with his biases in dealing with both his teammates' and other culture’s tactical fighters, including the veteran pilot Yui Takamura herself.