Detective Sherlock Holmes Is Also a Vampire

This is a cannibalistic world. Steam allows humans to fly into the sky, and also allows humans to be trampled into the mud by machines. The secret method allows human beings to obtain transcendence, and also allows people to be dragged into the darkness by monsters. Charlotte, a time traveler, couldn't let himself eat people as a matter of course, so he chose... To eat vampires. A third-rate detective, a first-rate vampire. "Me! Sherlock Holmes! My detective career can be summed up in four words - I can fight and eat!"