Mahou Mitsubainin: Gokudo, Isekai wo Hametsu e to Michibiku

is a Japanese light novel series written by Masaru Masaka, with illustrations by Eiri Iwamoto. The series began publication on February 10, 2017 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Chishio Narishima, a former gangster who was begged by an girl and flew high to another world. But there he encountered a desperate world of blood-washing, far from an easy-going fantasy.

What the slaughtered protected in exchange for their lives-it is a drug that draws "magic" from the person who took it = a magic drug.

"I'll end the illusion." Chishio signed a contract with the only two remaining sisters. And the most dangerous man wears blood, smoke and tricks, survives a cruel different world, and eventually leads to ruin.

Another world x gangster. A different world dark fantasy spun with the worst combination that you should never have met.