Aya, Yoji, Ken, and Omi are the four young men who comprise Weiss Kruez (WK), an assassin group who eliminates certain menaces to society. Each member has his own trademark fighting style. Aya is adept at fighting with a katana, Yoji has mastered the art of strangulation via strings, Ken is lethal with his metal claws, while Omi specializes in a wide array of projectiles. Under the command of a mysterious man known only as "Persia", the WK is dispatched to take care of drug rings, terrorist factions, and the like. But as things go along, they discover that most, if not all, the bad elements they have dealt with are somehow connected to the Takatori family. The Takatori family is rich, powerful, and influential. It seems if the problem is to be nipped in the bud, the WK would have to put an end to one of Japan's most prominent clans.

Aya, Yoji, Ken, and Omi are the four young men who comprise Weiss Kruez (WK), an assassin group who eliminates certain menaces to society. Each member has his own trademark fighting style. Aya is adept at fighting with a katana, Yoji has mastered the art of strangulation via strings, Ken is lethal with his metal claws, while Omi specializes in a wide array of projectiles. Under the command of a mysterious man known only as "Persia", the WK is dispatched to take care of drug rings, terrorist factions, and the like. But as things go along, they discover that most, if not all, the bad elements they have dealt with are somehow connected to the Takatori family. The Takatori family is rich, powerful, and influential. It seems if the problem is to be nipped in the bud, the WK would have to put an end to one of Japan's most prominent clans.

Koua is an academy that brings Japanese's most talented people and students together. The mission is to train talented people to bear the world's future leadership. However, recently, the suicide rate in the academy is increasing and there is hardly any information being released to the public. Fujimiya Aya is sent to infiltrate this school carrying out criminal investigation and disguise himself as a teacher. In fact, actually, there is a connection between Koua academy and the global terrorist activities that are frequently occur. Therefore Persia assigns Hidaka Ken and Kudou Youji as well into this mission to solve the truth and connection of the incident behind Koua academy.

Someone out there is determined to see the fall of Weiss Kreuz, and it looks like they have found the perfect plan for it. The four assassins find themselves trapped in a deadly game of deceit, where the question of honor versus duty comes to surface. Now they must fight for their own reasons to survive--and there can be only be one victor in this field of death.

The story follows the main characters Takeshi and Michi as they get lost in the Card Battle world and have to win card battles to return home.

The story follows the main characters Takeshi and Michi as they get lost in the Card Battle world and have to win card battles to return home.

Satou Tatsuhiro, 22 years old, thinks that everything that happens around him is a conspiracy. He even figured out who is behind it all: The NHK, an evil secret company. "When you think anime, you think otaku. When you think otaku, you think people that dislike other people. Those people become hikikomori (people who shut themselves in)". So Satou manages to uncover the plot of The NHK (stands for Nihon Hikikomori Kyokai), after three years of shutting himself in (and rapidly approaching the fourth). In reality, he is nothing more than a NEET (Not in Employment, Education or Training), desperately in need of a cure from that "disease". He wants to break out from the curse, but going out and getting a job is frightening enough for him. That is until he gets selected for a "project"; it is a plan to help hikikomori like him in facing the reality of this world.

Satou Tatsuhiro, a 22 year old young man, is a NEET (Not in Employment, Education, or Training) and a hikikomori (meaning acute social withdrawal). He believes everything around him is a conspiracy, including the reason why many people, himself included, become hikikomori. Due to this, Satou creates a strange conspiracy theory which includes the Nihon Hikikomori Ky?kai (NHK), a secret organization with the intention of producing a hikikomori filled world. Satou intends to break free from the NHK’s clutches, but cannot, since he finds it too frightening to go outdoors by himself; that is, until he meets Misaki Nakahara, who selects Satou for her “project” that she claims will cure him of his hikikomori ways.

A tiny mountain village in a remote woodland region. Five primary school kids have come together in this idyllic spot in order to spend their summer holidays at a camp. At first the children enjoy carefree days amidst unspoiled nature far away from adult supervision. But their life changes dramatically when they come across what they believe to be a small dog, badly in need of help. The creature – known as Pochi – turns out not to be a dog at all but an alien on an important mission. It seems there is a mysterious substance on earth that is coveted throughout the universe. Pochi had almost found it but was so badly injured during a fight that he had to give up his search. Thanks to the children's help, the alien survives – and decides to reward them generously. “Where would you most like to travel?” is the question Pochi puts to his rescuers. Their answer is prompt, if vague: “As far as possible!” Pochi suggests they try the moon first of all, and so, the alien whisks away the kids to the satellite next door. This marks the beginning of an absolutely amazing adventure. During the course of their travels they discover that the substance coveted throughout the universe is in fact also integral to Japanese cuisine – and it just so happens that one of the kids has some of this mysterious substance in his pocket.

10 years since the great war, tensions were mounting within the country of Wellber, which was barely capable of keeping peace, as war could commence at any time with its neighboring country, Sangatras. In order to avoid warfare, the king of Wellber, Haidel planned on marrying off his daughter, Princess Rita, to Sangatras` Prince Guernia. However, Rita stabbed her groom to be and ran away. Infuriated, Sangatras` King Ranbahnhof threatens to wage war unless Rita is captured and publicly executed within 14 days. In order to avoid the worst case scenario, Rita decides to head for the neutral country of Greedom. Meanwhile, the woman thief Tina sneaks into Castle Wellber, seeking its treasures, when she happens to witness the stabbing of Guernia by Rita. Whether it be by coincidence or necessity, Tina receives information that the "Wasp Man" she was after is in Greedom, her sworn enemy who took the life of her parents. Tina agrees to become Rita`s bodyguard as they head out to Greedom. Shouldering their fate and destiny, the two meet, leave, and set out on their journey. What awaits them is war or peace, vengeance or death...

The loquacious sentient tank, Gyrano De Borgerac seems very busy being pampered by solicitous maids. The fairy Sherri, too, is enjoying the luxury of the court's life. And for Rita, time has come to face her duties as princess of Wellber. But Tina is resolute: she wants to continue her search for the Man with a tattoo of Bee the Death, the devil who exterminated her family. An unspeakable feeling of sadness fills the hearts of the two girls, who shared so much and are now about to say farewell to each other. And then, on the day of Tina's departure... A new journey that will take Tina walking through the still sore scars of the Great War that wiped out entire cities ten years before, until the unsuspected truth about her nemesis!

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