Cecil arc (7)

Cecil is the arch character of Two Clusters, appearing in all generations either directly or indirectly.

This is his story.

This arc is complete.

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Shattered union arc (10)

If you want a central plot to follow, this is the arc you should start with.

This arc deals with the general political situation in Sol system from A.D. 9599 to 9747.

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Legends arc (3)

This arc covers stories that don't deserve its own arc.

It's often legends and historical events. There is no time limit or main character in this arc.

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Kain & Suu arc (11)

This arc is regarding two characters of opposite briefs: Kain & Suu.

This arc is closely related with Shattered union arc and Juron arc.

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Masu arc (9)

This is Masu's story and, after his death, his son's.

This arc is closely related to Cecil arc.

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Ashuta arc (7)

Ashuta is the main character here, who is just an ordinary person who just happened to be sacrificed for politics.

The whole point of this arc is that he is an ordinary guy. Being average is the hardest, sometimes.

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Hammers arc (11)

"The Hammers" is a group of people handpicked by Cecil.

This is their stories.

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Juron arc (6)

Juron is a class S ESP working for Andromeda union.

His goal is simple: Destroy United Sol.

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White Knight arc (4)

Juun, the white knight.

This is his story.

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Black Knight arc (4)

Eran Gro, the Black knight.

This is his story.

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Hermit arc (3)

Ssil's story, who is a class S ESP.

She's also the leader of the Gypsies.

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Alien arc (6)

This arc is different from other arcs.

This arc begins in even further future. The time is set in year 12328. It basically skips about 5 generations from year 9599. This setting has huge inspects on a lot of things. United Sol is just a record in a history book for an example.

The story starts basically anew with new characters.

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Milk way arc (5)

A tragic story.

This arc is complete.

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Repairman arc (4)

Stories about repairmen in various time and places.

There is no main character in this arc. Each story is isolated from another.

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Sae arc (3)

This arc used to be called "Moasic arc".

This is Sae the little witch's story.

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The blue planet arc (1)

This arc should be read after reading alien arc, but it's standalone.

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