This is a story set in the far-off future. In the wake of the catastrophe known as the Great Disaster, humans could no longer remain on Earth, and fled into space to avoid extinction. A new age had begun in unexplored skies, and a new space calendar (S.D.) was instituted. Time passed, and now we've reached the year 1484 S.D. Colonies orbit Earth's moon and Mars. Human beings have found a way to sustain themselves in outer space. Footsteps of pioneers could be heard as they echoed past Saturn. Technology advanced and people molded their environments to make them inhabitable. The advent of rounders revolutionized life in space, allowing people to paint the very skies themselves. Senko no Ronde is a tale of rounders and their pilots.

1484 S.D. Within the Arria Federation a weapon of mass destruction was stolen along with a terrorist attack.
Following the Secret Weapon Heist, it became apparent that the Arria Federation was in possession of a weapon that violated international law, and they immediately receive spacewide condemnation. Over time the balance of power within the Federation begins to fall apart, and there come to be whispers of secession.
In the midst of that turmoil the figure of Luchino Narukami emerges. As a member of the Narukami family, which is currently in power, he garners sympathy as a victim and begins his ascent. He is young, charismatic, and a beacon of change. He promises a new age for Arria, which wins him remarkable favor on the international stage.
But then something happens... An armed conflict arises in the Arria Federation's Martian colony, Harmonia. Word that Luchino Narukami has orchestrated the fight begins to spread.
1486 S.D. Our story begins...


Old World

"This refers to the A.D. period preceding the present S.D. way of marking years.
Although civilization had become quite advanced on Earth, it was destroyed in the Great Disaster.

The precise cause of the destruction is unknown, as the information is guarded closely by the Allied Nations. However, the story that has been handed down over the years is that the ecosystem was destroyed by a highly infectious disease that grew to epidemic proportions."


These are man-made human beings.
International law expressly forbids biotechnological research into areas such as gene manipulation without special permission.
The reason for this is to restrict the development of these artificial humans (androids).
However, there do exist some androids who were created using forbidden Old World technology.

More recently developed androids are indistinguishable from normal humans and are traded on the Silk Road of the modern day underworld.
These androids are commonly referred to as shams.

Space Calendar

After the Great Disaster of the Old World, those who fled Earth to survive established a new calendar, using the designation "S.D."
The Council of Life was founded in the wake of the Great Disaster as the highest-ranking governing body of the new world, and its establishment marked the first year of the new calendar.

Travel to Earth has become strictly controlled, and the fresh civilization that has grown up during the years of the S.D. calendar exists in colonies orbiting the Earth, the Earth's moon, and Mars.
Today, development stretches out as far as the orbit of Saturn.
Technological development since leaving Earth has been focused on the ability to survive in outer space, which has resulted in the loss of many Old World technologies and knowledge.

Senko no Ronde 2 takes place in 1486 S.D.

Council of Life

This is the new world's highest-ranking governing body established in the wake of the Great Disaster.
It was responsible for bringing those who escaped Earth together in working towards the primary goals of the survival of the human race and someday returning to Earth.
Many years after its founding, around the latter half of the third century S.D., a plan to return to Earth was nearly successful, but the unity within the Council began to deteriorate. Several new national regimes sprung up in opposition.
With the founding of the Allied Nations in 522 S.D., the Council of Life had run its course.

Allied Nations

Founded in 522 S.D., this became the de facto highest-ranking organization in modern civilization, replacing the Council of Life.
It was established so that law and order might be upheld across all nations under international law, and it was set up to take action to resolve international disputes.
Now in 1486 S.D., it has begun to lose power as corporations cannibalize and take over the various nations.

Earth Homecoming

Though at the time people could no longer survive on Earth in the wake of the Great Disaster, around 120 S.D. the possibilities for a plan to return to Earth were explored.
After many long years, in 282 S.D. a research team was finally successful in landing on the planet.
However, around 320 S.D. conflicts over personal interests began to arise concerning people's legacies and what had been left behind.
Tensions escalated into an all out war over the territories of Earth (War of the Oak/Grucia Earth Colonies, 471 S.D.).

The outcome was that the Humanity Council ceased to be the highest-ranking power of the land, and the Allied Nations was formed.
The Earth was declared a neutral planet under the supervision of the Allied Nations, rather than any one nation.

Mars System

A giant cluster of colonies form an orbital ring around Mars in addition to residential domes on the Martian surface.
Collectively, these are known as the Mars System.

Using colonies that had existed on Mars since the days of the Old World, around 500 S.D. existing facilities were appropriated with plans to terraform the planet.
But due to tremendous costs and popular opinion that Mars was only good for mining resources, and not for permanent residence, the execution of these plans was cut short.
For these reasons, living environments today are only constructed on the surface in conjunction with mining facilities.

Arria Federation

In 624 S.D., the Federation was founded as its own nation state.
It is massive, holding sway from the Earth to Saturn.

Although technically governed using a constitutional monarchy, in truth it is ruled over by those who have held great power reaching back into the distant past (with close ties to royalty).
Due to the Secret Weapon Heist two years prior (1484 S.D.), it was discovered that the Arria Federation possessed a Mega Photon Cannon, which was prohibited under international law.
This caused the Federation to be widely denounced by the international community.
This kicked off a spread of power to other non-mainstream groups within the Federation.
Rivalry between these factions has been intensifying.

Embassy Occupation Incident

This is the name of an incident that occurred in 1478 S.D.

A militant group occupied the embassy of the Arria Federation in the lunar city of Giovanni. When Federation forces moved in to retake the building, the criminals triggered an explosive device. This resulted in the deaths of not only the terrorists, but also most of the hostages and special forces.

Because the central authoritative figure of the time was also killed, this event had a major impact on the future of Arria.
The captain of the Federation's elite squad (forerunner to the S.S.S.) who had overseen the mission, Ansel Modred, disappeared after the incident.
Karel Werfel (operating under the codename "Brave" at the time) and Sakurako Sanjo, who were members of the elite squad, left the infiltration team.

Secret Weapon Heist

This is the general name applied to a series of terrorist incidents that occurred within the Arria Federation in 1484 S.D.
They form the main story of the first Senko no Ronde.

For further information go to the Gallery Menu and under [Miscellaneous], look in [Senko no Ronde] for [SnR 1 Summary].


Harmonia is a self-governing region within the Arria Federation. It consists of a small colony in the Mars System, as well as some Martian land.

As an important location during the development of Mars, Harmonia has almost always been autonomous, and has contributed greatly to the economic successes of the Arria Federation.
In recent years, opinions have become conflicting within Harmonia over its efforts to remain independent of the Arria Federation.
The result has been an outbreak of civil war involving areas under direct control of the Arria Federation.

These troubled times have seen the emergence of an organization composed mainly of independent militias for the purpose of self-defense known as the Harmonia Volunteer Force (abbreviated H.V.F.).


This is the abbreviated title of the Goddiver Security Organization, the private security force of the Goddiver group.
The Arria Federation entrusts the security forces of private companies to maintain peace and order throughout its territories.
G.S.O. is one such organization.

Sakurako, Changpo, and Cuilan are members of Security Unit 4 located in the lunar city of Giovanni working to resolve trouble that arises using rounders. In Senko no Ronde 2, they have been sent to G.S.O.'s Mars Section in the Mars System.


This is an abbreviation for the Special Space Service affiliated with the Arria Federation Army.
They gather ace rounder pilots by hiring the winners from piloting competitions.
They have become renowned far and wide.

At the Federation Military Academy, students who excel in rounder piloting are put on track to join the S.S.S., and the caliber of the elite military training they receive has also become highly regarded.

For this reason, these pilots do not occupy the front lines, but engage in special operations and behind-the-lines support, such as reconnaissance and infiltration.


Rounder is the common name for Pilotable Shell Units used to move about and engage in various activities in the low-gravity environment of outer space.

Used for working outside of spaceships, the reinforced shells have evolved and improved according to their function, giving them their present day appearance.
In recent years the product has taken on an air of refinement and swagger in appealing to the tastes and preferences of customers, much like automobiles.
Those with high-level licenses, as well as their crafts, are called Hi-Rounders, and they are envied as proof of elite status.
There is also a battle support system that temporarily supercharges battle rounders with increased firepower and weaponry referred to generally as B.O.S.S. (Booster of Over-armed Shell System).