Hellsing Ultimate

Hellsing, a secret organization of the British government, has long been battling supernatural threats to keep the people safe from creatures of the night. The current leader, Integra Wingates Hellsing controls her own personal army to eliminate the undead beings, but even her highly trained soldiers pale in comparison to her most trusted vampire exterminator, a man by the name of Alucard, who is actually a powerful vampire himself. Along with Integra's mysterious butler and Alucard's new vampire minion, Seras Victoria, The Hellsing Organization must face not only regular ghouls and vampires, but a rivaling secret organization from the Vatican, and Millennium, an enigmatic group of madmen spawned by a certain war over 50 years ago... A bloody battle between monsters is about to begin, the dead are dancing, and all hell is singing...

Claymore

A brutal scourge stalks the land. Yoma, monsters driven by a hunger satisfied by only one quarry - Humanity. The dark breed knows but a singular foe: Claymore. Human-Yoma hybrids of extraordinary strength and cunning, the Claymores roam from skirmish to skirmish delivering salvation by the edge of a blade. Thus begins the twisting tale of Clare, one such sister of the sword driven by pain in both victory and defeat. A child silent and suffering hidden in her past, Clare's march toward vengeance unfolds along a path marked by violence, solitude and scorn. In a land where even the predator is prey, the haunted hearts of hunter and hunted alike wear the scars of the age. (Source: Funimation)

D.Gray-man

Towards the end of the 19th century, Allen Walker officially joins the organization of Exorcists that destroy the beings known as Akuma; mechanic weapons made by the Millennium Earl with the suffering souls of the dead. Allen has both a cursed eye and an anti-Akuma weapon as an arm, bearing the power of "Innocence", a gift given to him as an apostle of God. Allen, along with his fellow Exorcists must put a stop to the Millennium Earl's ultimate plot that could lead to the destruction of the world and all who live on it.

Vampire Knight

Cross Academy is an elite boarding school with two separate, isolated classes: the Day Class and the Night Class. On the surface, Yuuki Cross and Zero Kiryuu are prefects of the academy, and attempt to keep order between the students as classes rotate in the evenings. As the night class is full of utterly gorgeous elites, this can sometimes prove to be a bit difficult. It is completely necessary, however, as those "elites" are actually vampires. Yuuki and Zero act as guardians, protecting the secrets of the Night Class and the safety of the ignorant day class. As the adopted daughter of the academy's chairman, Yuuki takes her job with a serious and energetic attitude. It also allows her to interact with her secret crush and savior, the night class' dorm president, Kaname Kuran. Zero, on the other hand, has a deep-rooted hatred against vampires, and at times, does not hesitate to kill. Can vampires and humans co-exist, even in the strict setup of the Cross Academy? Only time will tell. (Source: MAL Rewrite)

Corpse Princess: Aka

After being brutally murdered along with her family, Makina Hoshimura turns into a Shikabane Hime, a living corpse contracted to the Kougon Cult, in order to exert revenge on the mysterious undead organization responsible for her death. She is assisted in this task by Keisei Tagami, her contracted priest and former friend. This series follows the story of Keisei's younger brother Ouri, a boy with an unusual attraction to death, who slowly discovers his brother's secret and gets dragged into the world of the Shikabanes. (Source: Wikipedia, edited)

Trinity Blood

The background is in the distant future after the destruction brought about by Armageddon. The war between the vampires and the humans continue to persist. In order to protect the humans from the vampires, the Vatican has to rely on other allies to counter the situation. The protagonist, Abel Nightroad, is a traveling priest from the Vatican and a crusnik, a vampire that drinks the blood of vampires. He is a member of the "Ax", a special operations group led by Cardinal Catherina Sforza. He encounters a young girl called Esther, who decides to go with him to Rome and train at the Vatican. Soon after he meets her, the order of Rozencreuz, led by Abel's twin, Cain, tries to continue the war so they can rule the world. It's up to Abel and the AX to try and stop them.

Parasyte -the maxim-

They arrive in silence and darkness. They descend from the skies. They have a hunger for human flesh. They are everywhere. They are parasites, alien creatures who must invade–and take control of–a human host to survive. And once they have infected their victims, they can assume any deadly form they choose: monsters with giant teeth, winged demons, creatures with blades for hands. But most have chosen to conceal their lethal purpose behind ordinary human faces. So no one knows their secret–except an ordinary high school student. Shin is battling for control of his own body against an alien parasite, but can he find a way to warn humanity of the horrors to come? (Source: Del Rey)

Hell Girl

Somewhere in the vast sea of the Internet, there's a website that can only be accessed at the stroke of midnight. Known as the Jigoku Tsushin, rumor has it that if you post a grudge there, the Jigoku Shoujo will appear and drag whoever torments you into the inferno. Very little is known about the girl - all we know for sure is that she lives with her equally enigmatic grandmother, that three magical straw dolls accompany and serve her, and that whenever a posting on the Jigoku Tsushin moves her, she becomes the Jigoku Shoujo.

Blade

The story revolves around Blade, a "Daywalker" vampire hunter who was born with vampire and human blood after a vampire attacked his mother. While visiting Japan on a mission, Blade tracks down Deacon Frost, the vampire who killed his mother. Blade confronts "Existence," a mysterious organization composed of vampires modified by Frost. (Source: Anime News Network)

Guyver: The Bioboosted Armor

Lurking under the facade of everyday life lies a dark world of pain and destruction.​ The world is controlled by a sinister brotherhood that hides their fangs behind masks of humanity.​ They are the Chronos Corporation.​ While investigating a mysterious explosion near his school,​ Sho Fukamachi happens upon the Chronos Corporation's greatest weapon: a techno organic suit of bio armor known as "the Guyver.​" But Chronos is determined to conceal their secrets at any cost.​ Sho soon finds himself relentlessly pursued by its army of horrific bio-monsters.​ With nowhere to run,​ Sho is forced to call upon the fearsome power of the Guyver and rip his opponents limb from limb in a desperate struggle for survival.​ (Source: Funimation)

Grave of the Fireflies

In the aftermath of a World War II bombing, two orphaned children struggle to survive in the Japanese countryside. To Seita and his four-year-old sister, the helplessness and indifference of their countrymen is even more painful than the enemy raids. Through desperation, hunger and grief, these children's lives are as heartbreakingly fragile as their spirit and love is inspiring. (Source: Sentai Filmworks)

MONOGATARI Series: OFF & MONSTER Season

The sequel to the 'Final Season' story arc of the Monogatari</i> series. From the past to the future, their story continues. </i> Now that he has graduated from high school, Koyomi Araragi’s story ends here. His story is truly over now, but the stories of the girls Koyomi saved - their stories - are not over yet. This is the prequel or sequel to their stories and their struggles. (Source: Monogatari Series USA Official Website)