Gundam X Goetia74; reawaking calamity war [Gundam; IBO X Highschool DXD]

The calamity war, a gruesome war against rouge machines named after the angels of heaven, those has been dubbed by the designation; Mobile armor, and to fight back the forces of humanity now has built machines named after the demons of the arse goetia...and fast forward to a distant present...as ironically unserious as it may be, and no demons are not uncivilized monstrosities, since they all have their usual day to day lives, and even work and go to school, co-existing with all sorts of ...but that isn't the case anymore when a girl who has lived in space with the contract of a devil of her own, as she searches for her own family, as the worlds of the supernatural now meets the technological...the goetia isn't even it's name...it's name is actually...GUNDAM...let's go Gremory!