Ichirou Inuyashiki is a boring salaryman reaching old age. He spends his days alienated at work and at home, but one day he is suddenly diagnosed with cancer and falls into despair. That’s when, thanks to a certain accident, he receives super-hero like powers.

Then there’s high-school student Hiro Shishigami, who was also involved in the accident and starts using the powers he received as he wishes.

Is the true nature of humans good or evil? These two who have gained great powers start to move according to each of their feelings.

Once every twelve years, a twelve-way battle royale is held, and this year is the 12th time.
Twelve ferocious fighters carrying the names of the twelve characters of the Chinese zodiac fight, wagering each of their lives and souls. These strange twelve participants are the rat, the ox, the tiger, the rabbit, the dragon, the snake, the horse, the goat, the monkey, the rooster, the dog, and the pig.

The one who emerges victorious can have one wish granted regardless of the circumstances.

There is one wish that each contender wants granted no matter what...

Who will survive until the end?

On a battlefield where strategy and slaughter swirl together, whose tears will be the one to fall?

The battle royale that will shake your soul is about to break out.

Nobuaki Kanazawa has just transferred to a faraway high school. Due to something that he experienced at his previous school, Nobuaki is afraid of becoming close to his classmates and has closed his heart towards them. However, on Sports Day, during the class relay race, he takes a chance and begins to open up to them.

In the middle of all of this, all of his classmates, himself included, have one email from a something called “King” delivered to their cellphones. The students all regard it as some simple trick, but Nobuaki knows exactly what this is. A conflict known as the game of “death” is about to begin.

Rules of King’s Game
1. Full class participation is mandatory.
2. Please follow all of the orders in the emails that are delivered from the king within 24 hours.
3. Those who do not follow the orders will be punished.
4. You cannot quit Kings Game part of the way through.

In this modern society, a new kind of “illness” is striking young boys and girls; Loneliness, disbelief and outrage push this generation to get more or more attached to Internet and technologies. The experts called those symptom “Net Addiction”. To prevent that, a certain Rehabilitation Facility has been set up to “Lead the young man back to the right path”. Enrolled to treat is addiction, Hibiki had no idea that this Rehabilitation Facility is nothing more than a prison. In this place where it’s not permitted to escape, how will Hibiki challenge despair in this hell?

After a certain incident Ren Fujii, a student at a school in Suwahara City, gets into a fight with his best friend Shirou Yusa. However, this was no ordinary fight - it was like a fight to the death, and Ren ends up being forced to spend two months in the hospital.

It's December when Ren is finally discharged. Feeling as though he’s lost half of himself, he thinks he must build a new life, one without Shirou. But although he wants to treasure what he still has, that too begins to fall apart. He’s plagued by nightmares. There’s a mass-murderer on the rampage, with black-cladded ‘Knights’ on their tail.

In this increasingly insane world, Ren steps out alone to cross the border between the ordinary and the extraordinary, wishing for nothing more than to return to the dull but warm days of his past. But how will Ren see things in the end, after getting involved in the continuation of a war from the past?