"Night of the Beasts" is a manga series that blends elements of horror, action, and supernatural intrigue. The narrative centers around a world where humanity is threatened by monstrous creatures known as Beasts, which emerge from the shadows to prey on humans. These Beasts are not mindless predators but possess intelligence, cunning, and a hierarchy that makes them formidable adversaries. The story unfolds in a dystopian setting where society has fractured, and survival is a daily struggle.

The protagonist is a young man named Kaito, who becomes entangled in the conflict between humans and Beasts after a tragic encounter leaves him with a mysterious power. This power, known as the Beast Mark, grants him enhanced abilities but also ties him to the very creatures he despises. As Kaito grapples with his newfound identity, he joins a group of fighters known as the Beast Hunters, who are dedicated to protecting humanity from the Beasts. The group is led by a seasoned warrior named Rina, whose tragic past fuels her relentless drive to eradicate the Beasts. Other key members include Hiroshi, a strategist with a calm demeanor, and Yuna, a skilled fighter with a personal vendetta against the Beasts.

The plot delves into the origins of the Beasts, revealing that they are not merely monsters but the result of a failed scientific experiment gone awry. This experiment, conducted by a shadowy organization, sought to create superhuman soldiers but instead unleashed a plague of Beasts upon the world. As Kaito and the Beast Hunters uncover the truth, they face increasingly dangerous foes, including evolved Beasts with unique abilities and human collaborators who seek to harness the Beasts' power for their own gain.

Themes of identity, morality, and the cost of survival are explored as Kaito struggles with his dual nature. The Beast Mark not only grants him strength but also threatens to consume his humanity, forcing him to confront the possibility that he may become the very thing he fights against. The series also examines the bonds formed between the Beast Hunters, highlighting their camaraderie and shared purpose in the face of overwhelming odds.

As the story progresses, the stakes escalate, with the Beast Hunters uncovering a conspiracy that reaches the highest levels of power. The final arc sees Kaito and his allies confronting the mastermind behind the Beasts, leading to a climactic battle that will determine the fate of humanity. The series concludes with a resolution that ties together the central conflicts while leaving room for reflection on the enduring struggle between humans and the monsters they create.