If you're looking for anime similar to Luger Code 1951, you might like these titles.
In secret, alien parasites drift downwards toward Earth. Their directive: to take control of a human body and thrive in secret. When a parasite attempts to take over Shinji, an ordinary high school student, he stops it in his arm to save his mind. With the strange power of amorphous muscle, the curious parasite strikes an uneasy truce with Shinji: it will keep him alive and strong so that it may continue living, and will help protect him from the other parasites that might not take kindly to Shinji's mind still actively working. Can Shinji gain the courage to face the parasites and protect humanity? And would it even make a difference if he did?
This one is almost a stretch in how similar it is but even then it shares alot of basics and the same essential story core concepts. In both cases there are monsters fighting humans. A human is at the cruxt of the fighting and on the verge of providing a turning point. Both main characters go through some rapid changes to deal with these monsters on their own terms. In both cases, these changes help save the lead character's life at a critical point.
Over a century ago, mankind was devoured by giant beings of unknown intelligence and origin known as Titans – creatures that eat humans alive indiscriminately and for no apparent reason. The remaining population has managed to survive the last hundred years only by building a multi-walled city capable of keeping the Titans at bay, training military recruits to patrol the perimeter and gather intelligence about their mysterious foe. Eren and Mikasa have lived a relatively peaceful life behind the city's walls, but when a massive Titan appears, smashing the outer barrier and unleashing a wave of terror, their lives are brutally changed forever...
Luger is slightly more similar to Titan than it is to Parasyte. Both stories are about monsters fighting humans with humans essentially on the losing end and needing a miracle to turn the tide of war. The way that miracle happens is similar in both stories though whether that miracle is followed through in Luger I can not say since the story so far is too short to answer that question. Monsters in both have been shown to have an appetite for eating humans. In both shows, the enemy monsters prove to have infiltrators of one kind or another. Even in the manga version they were described as using such tactics to subvert attempts to study the enemy. These infiltration tactics are what inspire the humans in both stories to take a risk out of desparation. At the same time these methods put the heroes in greater dangers.
It is June of the year CE 1923. A young girl with blond hair and blue eyes, Tanya Degurechaff, has entered the final curriculum of the Imperial Military Academy and is training at the third patrol line in the northern military district, the Norden Theater, as part of her service to the force. Her training, the first step toward a brilliant career as an aviation mage, should have gone off without a hitch... but things took an unexpected turn.
Luger and Tanya take place in an alternate European WWI/WWII like setting but in a fantasy version of realtiy with the supernatural. The main characters find themselves in midst of powerful supernatural forces that greatly affects their lives. Both are key components to victory for their factions in each of their stories. Both lead characters are not interested in war nor getting caught up in the dangers thereof but they both fulfill their duties nonetheless if not reluctantly and with lots of self doubts and anxieties.
It has been 11 years since the defeat of the Joestar's arch nemesis, Dio. In 1999, Jotaro Kujo went to Morioh in S City in M Prefecture, Japan, to find his grandfather, Joseph Joestar's secret child, Josuke Higashikata. However, Josuke had the same ability as Jotaro, the Stand. And as though Jotaro was summoning them, a new group of Stand Users start to make their moves. There's something in this town... Josuke rises up to save Morioh, his hometown that he grew up in.
Giorno Giovanna is a young man that lives in Naples and is the son of DIO, the nemesis of the Joestar family. When he was younger, he was oppressed and started acting out, but one day, he saved a gang member and then learned how to trust people. Bizarrely, he never forgot that and learned how to be respectful with his own gang that straightened him out. That’s also how he started aspiring to become a Gang-Star. Now fifteen, Giorno gets in trouble with the gang Passione, which controls the Italian mafia underworld, and now, he’s being targeted.
Sakura Sakurakouji may seem like a frail and demure girl, but in reality she’s a powerful martial artist with an unmatched sense of justice. One day, on her way home from school, she witnesses a boy murdering several people with bright blue flames. That boy is Rei Ogami, a merciless assassin known as a "Code Breaker", and the latest student to join Sakura’s class! While Rei appears to be the perfect gentleman at school, in truth he lives by the principle of "an eye for an eye" and is hired to target and dispose of criminals who have escaped the law. With everyone oblivious to his true nature, only Sakura knows what he really is and his remorseless feelings towards what he does. But despite his icy heart and his threat to burn Sakura and everyone around her should she reveal his secret, the righteous teen can’t help but feel that there’s more to Rei than meets the eye...
When Jonathan Joestar was just a baby, his mother tragically died in a carriage accident, and his father George was saved by the kindness of a stranger, Dario Brando. At least, that's what George believed, unbeknownst to him that Dario was just attempting to steal from the victims. Thus, when Dario later dies and his son, Dio, comes to his doorstep, the wealthy George eagerly adopts the boy. But what should have become a budding friendship between two siblings quickly becomes a nightmare for poor Jonathan, as Dio is cruel, calculating and will go to great lengths to become George's primary heir. Little does Jonathan know that this unfortunate childhood is only the harbinger of things to come...
Silver, from the moment he was born, was destined to be a hunting dog. Named for the silver stripe on his body, his fate is sealed when his father is killed by the ferocious bear Akakaboto -- to be the one who kills Akakaboto. From that moment on, he vows to grow up, to become a strong enough dog, to slay the bear who stole his father's life.
An akuma is a soul which has been brought back to life through sadness and despair with the powers of Millenium Earl. Their mission is to terrorize the earth and all who dwell within it. The Black Order is a group of Exorcists that have sworn to cleanse the souls of the akuma, and collect the substance known as "innocence". This powerful substance can be used as an anti-akuma weapon, and ultimately can help destroy the evil Millenium Earl. Allen Walker is a young Exorcist who has the ability to tell who is human and who is an akuma with the help of his cursed eye. Together with the Black Order, Allen must find all 109 pieces of innocence to protect the world and defeat Earl.
Satoshi returns to his hometown after years of being away, carrying with him terrible memories of his past. He remembers the day Satoko Kisiki joined his class – it was the rainy season, and her unusual body made her an easy target for cruel bullying, though Satoshi never took part in the mean tricks that were played on her. However, soon he found himself relentlessly chased by a mysterious and deformed girl whose long dark hair obscured her face. Was this a simple case of a joke gone too far, or was a poor, mistreated girl looking to take revenge on those who made her life miserable?