One of Advena Avis immortals. Aside from Elmer, Huey sees everyone, including his own children, as possible test subjects for his experiments.  Huey has many groups, of both humans and non-humans (his homunculi), working under him, like the Lemures and the Lamia. In the 1930s, Huey is arrested for terrorism and sent to Alcatraz. However, he still seems to be able to communicate with outside world, aggravating Victor to no end.   ~!Huey's mother was killed during the witch hunts which left him angry at humanity and wary of others. However, after meeting Elmer he begins to open up again, and even lets himself fall in love with Monica.!~

During the early 1930s in Chicago, the transcontinental train, Flying Pussyfoot, is starting its legendary journey that will leave a trail of blood all over the country. At the same time in New York, the ambitious scientist Szilard and his unwilling aide Ennis, are looking for missing bottles of the immortality elixir. In addition, a war between the mafia groups is getting worse. On board the Advena Avis, in 1711, alchemists are about to learn the price of immortality. 
Based on the award winning light novels of the same name, this anime adaptation follows several events that initially seem unrelated, both in time and place, but are part of a much bigger story&mdash;one of alchemy, survival and immortality. Merging these events together are the kindhearted would-be thieves, Isaac and Miria, connecting various people, all of them with their own hidden ambitions and agendas, and creating lifelong bonds and consequences for everyone involved. 
(Source: MAL Rewrite)

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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 &amp; MAL Rewrite)

Three DVD-only episodes made from the light novels, which flesh out characters and plot events from the original series and establish closure to the story as Carol and the Vice President return to New York.

New York, 1927. 
In a corrupt city where crime rules the streets, Firo Prochainezo is in the Camorra, an Italian criminal syndicate distinct from the mafia. Though a member of the relatively small Martillo family, Firo has big ambitions and is determined to make his mark. But while the Martillos may not be the biggest bad guys on the block, they've got some distinct advantages working in their favor. Does Firo have what it takes to become a made man? 
Let the crazy ruckus begin! 
(Source: Yen Press)

In 1705, a rash of murders takes place in Lotto Valentino, a provincial city on the Italian peninsula. The murderer, who wears a pure white mask and places one such mask on all of their victims, is known as the "Mask Maker," and anyone who witnesses their murders becomes their next victim. Huey Laforet, a boy who attends a "private school" for alchemy, hates everything about the world. Monica Campanella, his schoolmate, confesses her feelings for him. Elmer C. Albatross arrives in town as the school's newest student. Niki, a merchant's slave girl, witnesses one of the Mask Maker's crimes. All four youths must confront the Mask Maker and a conspiracy to control the entire city — the start of a 300-year-long struggle amongst immortals.

In 1711, a group of alchemists seeking eternal life gathered on a boat to summon the "demon" that held the secret. The demon agreed to give them what they wanted&mdash;an elixir of life, the method to create more, and the secret to ending their new-found existence. The following night, alchemists began disappearing, "eaten" by one of their own. Realizing the threat being close together posed, they decided to scatter across the world. Centuries later, in Prohibition-era America, the immortals have come together once again, and the "stupid commotion" (baccano) starts.