Mayumi Doujima promises her parents that she will give up on her dreams of becoming an astronaut on her 14th birthday if she cannot find a star she once saw long ago. Overhearing her troubles, the eccentric Manabu Soutouin offers to help her search for the star alongside the rest of Yubiwa Academy's mysterious Pretty Boy Detective Club, whose rules are as follows: "Be pretty, be a boy, and be a detective!" However, Mayumi is unique—she can see many things that ordinary people cannot. Her eyesight allows her to see the tiniest of details, from people approaching her at a distance to hidden traps that would otherwise go undetected. When the search for the lost star begins to sour, the Pretty Boy Detective Club end up entangled in something far beyond what they ever imagined.

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"I'm your daughter, and I also want to be your woman!" she, who has just come of age, declares to her foster father at his wedding, totally ruining it. The moment the truth of the murder six years ago comes out, her heart shatteres. "I hate you as much as I love you," she says to him.

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Ten years after the Holy War in Hong Kong, Mochizuki Jirou, aka the Silver Blade, and the lone hero who fought and defeated the Kowloon Children despite the loss of his lover, returns to Japan with his young brother, Mochizuki Kotaro. The two quickly discover that the Kowloon Children who survived the Holy War are seeking to infiltrate the “Special… more Ten years after the Holy War in Hong Kong, Mochizuki Jirou, aka the Silver Blade, and the lone hero who fought and defeated the Kowloon Children despite the loss of his lover, returns to Japan with his young brother, Mochizuki Kotaro. The two quickly discover that the Kowloon Children who survived the Holy War are seeking to infiltrate the “Special Zone”—a thriving city protected by an invisible barrier that will not allow Kowloon Children entrance—unless they’re invited. Red Bloods refer to the humans; Black Bloods are the vampires, and the Mochizuki Brothers are Old Blood—the last descendants of an elite clan of vampires. When Kotaro is abducted by one of the Kowloon Children, Jirou has no choice but to fight once more.

Ten years after the Holy War in Hong Kong, Mochizuki Jirou, aka the Silver Blade, and the lone hero who fought and defeated the Kowloon Children despite the loss of his lover, returns to Japan with his young brother, Mochizuki Kotarou. The two quickly discover that the Kowloon Children who survived the Holy War are seeking to infiltrate the "Special Zone" ,a thriving city protected by an invisible barrier that will not allow Kowloon Children entrance, unless they're invited. Red Bloods refers to the humans; Black Bloods are the vampires, and the Mochizuki Brothers are Old Blood, the last descendants of an elite clan of vampires. When Kotarou is abducted by one of the Kowloon Children, Jirou has no choice but to fight once more.

A near future, where humans have been defeated by the viral parasites named Gastrea. They have been exiled into a small territory and live in despair, side-by-side in terror. In this world trapped in darkness— Rentaro, a boy living near Tokyo and member of the "Civil Security"—an organization specializing in fighting against the Gastrea—is used to accomplishing dangerous tasks. His partner is Enju, a precocious young girl. They fight thanks to their peculiar powers until one day, when they receive a special assignment from the government. This top secret mission is to prevent the destruction of Tokyo... Set in a near future, this thrilling heroic-action story... starts now!

A near future, where humans have been defeated by the viral parasites named Gastrea. They have been exiled into a small territory and live in despair, side-by-side in terror. In this world trapped in darkness— Rentaro, a boy living near Tokyo and member of the "Civil Security"—an organization specializing in fighting against the Gastrea—is used to accomplishing dangerous tasks. His partner is Enju, a precocious young girl. They fight thanks to their peculiar powers until one day, when they receive a special assignment from the government. This top secret mission is to prevent the destruction of Tokyo... Set in a near future, this thrilling heroic-action story... starts now!

Train Heartnet is known as the Black Cat for his quick reactions to attacks and his title as Number Thirteen as member of the secret society Chronos. He is an unbeatable master gunman, a cold and unfeeling killer until he meets Saya, a bounty hunter, or “sweeper”. She teaches him the value of a human life, and that one should live in order to repen… more Train Heartnet is known as the Black Cat for his quick reactions to attacks and his title as Number Thirteen as member of the secret society Chronos. He is an unbeatable master gunman, a cold and unfeeling killer until he meets Saya, a bounty hunter, or “sweeper”. She teaches him the value of a human life, and that one should live in order to repent for one’s mistakes rather than die because of them. Through her, Train learns to love and care for other people as he too becomes a sweeper and travels with his partner Sven and the mysterious girl Eve.

Train Heartnet is the infamous gunman 'Black Cat', a cold-blooded assassin who works for the organization known as 'Chronos', bearing the mark XIII on his body. Most of his life was surrounded by violence, so Train is quiet, asocial and uncaring. However his life changes as he encounters the mysterious Sweeper (bounty hunter), Saya. Her unique way of living interested Train but tragedy occurs, resulting in Train changing the way he has lived towards the life of a Sweeper with newfound friends Sven and Eve.

Asta and Yuno were abandoned together at the same church and have been inseparable since. As children, they promised that they would compete against each other to see who would become the next Emperor Magus. However, as they grew up, some differences between them became plain. Yuno was a genius with magic, with amazing power and control, while Asta could not use magic at all, and tried to make up for his lack by training physically. When they received their Grimoires at age 15, Yuno got a spectacular book with a four-leaf clover (most people receive a three-leaf-clover), while Asta received nothing at all. However, when Yuno was threatened, the truth about Asta's power was revealed, he received a five-leaf clover Grimoire, a "black clover"! Now the two friends are heading out in the world, both seeking the same goal!

Asta and Yuno were abandoned together at the same church and have been inseparable since. As children, they promised that they would compete against each other to see who would become the next Emperor Magus. However, as they grew up, some differences between them became plain. Yuno was a genius with magic, with amazing power and control, while Asta could not use magic at all, and tried to make up for his lack by training physically. When they received their Grimoires at age 15, Yuno got a spectacular book with a four-leaf clover (most people receive a three-leaf-clover), while Asta received nothing at all. However, when Yuno was threatened, the truth about Asta's power was revealed, he received a five-leaf clover Grimoire, a "black clover"! Now the two friends are heading out in the world, both seeking the same goal!