Daites Ryou Koubouki

Milliana, the daughter of a duke in some remote region, used to enjoy a fujoshi lifestyle in her previous life in modern Japan. However, living in another world is pretty inconvenient., and on top of that, there are no BL books! Aiming for moe and pleasant life - including iron manufacture, communication, papermaking, and printing techniques - she begins a period of technological reformation! However, the Black Demon General Matisa busts into her life as the groom. With a bride who can freely use contemporary technology and a groom who unfolds her otherworldly cheat-like ability, here is the long-awaited unique reincarnation fantasy manga adaptation!

Note: The author passed away in a traffic accident in August 2017, leaving the source material for the manga, the novel incomplete. Vol 8 of the light novel was the last release, in June 2017. Vol 8's synopsis suggests the story was still meant to continue.