Etsusa Bridge Series

Aboard the Advenna Avis in 1711, a group of alchemists summon a demon in the hopes of gaining eternal life. The demon gives them an elixir of immortality and the method of ending their existence by "devouring" one another. Soon after, one among them begins to devour his companions. Realizing the danger posed by staying together, they scatter across the globe.
Centuries later in 1930's America, a certain federal investigator tries his best to combat the rise of organized crime during Prohibition, send a particularly infuriating terrorist to Alcatraz, and catch an outrageous thief duo. Meanwhile, the transcontinental train, the Flying Pussyfoot, begins its trail of blood across the country.
In 2002, a small group of the original Advenna Avis alchemists are on a journey to find the rest of their fellow immortals. However, there is one companion they did not expect to meet again.
Seemingly unrelated events, from a sleepy Italian city in the early 1700's to a modern luxury cruise ship traveling across the Pacific, reveal themselves to be far more connected than anyone could imagine...
(Source: Wikipedia & MAL Rewrite)

A girl with bloody iron pipes, sleepy eyes flickering - just talk.
"On the Islands, a gunshot echoes today. As usual. People die. As usual. Dogs and more dogs, the dogs, well, kill each other. As usual. The Bosses of the eastern sections, transform. As usual. A fellow murderer, using swords and the eastern sections of the cat, the brother Li Feng, the detective brother, cute guys, clumsy love. As usual. The Island, I'm terribly confused. ... as always. After all, as usual. The island today is As Usual. That's it. So I, as always, the cute child, hug a lot. It's warm. I'm... sleepy"
A series of short stories set on Etsusa Bridge.