This new theory by sanzenri argues that Nayuta no Kiseki is canon, that Nayuta Hershel is Towa’s great-uncle, and Campanella was the Grandmaster all along.

Sen no Kiseki IV states in its ending that you can’t get easily in or out of Zemuria, implying it’s a separate dimension of sorts. McBurn is from outside of Zemuria and has the hair ties fashionable in Nayuta’s world.

Campanella also lets slip that she’s actually a girl in some dialogue in IV. When both the heroes and antagonists split up into girls versus boys, Campanella joins the girls’ side. When pointed out, Campanella’s response is basically: “Oops”.

We already knew the Grandmaster is female.

Nayuta no Kiseki uses the term Executioner (Enforcer in English) for the Mythos agents charged with a sacred duties, like recreating the planet. Nayuta also shows that Mythos can split into two people and operate quite happily like that for years: one acting as the bad cop and the other as the good cop, and may even have different hair/skin color (although they remain the same gender and look the same otherwise).

The origin of Zemuria

So this is what I think is the connection between Nayuta and mainline Kiseki is:

When the Mythos’s civilization-ending catastrophe happened, Aidios, another Mythos, teleported an entire continent to another dimension. She converted her Star Power into the Septian power that exists now in Zemuria to keep it going. Then she either died, ascended or passed on her power to the Gralsritter, who founded a church based on her memory.

This is why the remains of the ancient civilization didn’t have any orbal tech: it didn’t exist until Aidios turned the continent into “Zemuria.” Before that, the Mythos used Star Power and humans used Mythos’s tech or primitive man-powered technology.

However, Septian power when used as orbal energy can run out, and that’s why Calvard is being desertified: the amount of orbal energy being used has increased astronomically. Furthermore, the rate is increasing exponentially with all the technological advancements.

The Grandmaster, who is another Mythos (maybe Aidios’s daughter, or a partially Mythos without much power) predicted this would happen after the Orbal revolution 50 years ago and founded Ouroboros 30 years after that.

She doesn’t have the Astrolabe to actually rebuild the world and she doesn’t have the Mythos’s Lightwings, like Creha and Signa have. What she does have, however, is advanced technological knowledge, familiarity with some Mythos culture, and the ability to become two people.

One half of her became the Grandmaster and the other half took on the essentially religious title of Executioner/Enforcer: No. 0, the Fool. After all, Campanella is basically playing pretend with a secret conspiracy composed of herself and herself! She used her Mythos skills (teleporting, tech, pretending to be more than one person), as well as the dramatic titles she gave operations and agents, to create the illusion of power. She used that to start recruiting people and actually create an organization that could deal with the problem.

“Campanella” calculated that even if she convinced everyone in the world to stop using orbments the fundamental problem would still be there and people would rediscover the technology eventually, so she came up with a more radical plan involving the Sept-Terrion. This is why she set out the rule that Enforcers must have some inner darkness and have the right to quit at any time.

She approached powerless, morally ambiguous and even evil people because she didn’t have any options and was hiding from the church on top of it: Enforcer No. 1 just wandered around; Enforcer No. 2 was a traumatized teenager; No. 3 may be a survivor of the war in Calvard, and so on. In short, people with potential, but not originally the world-class threats they appeared to be in the Trails in the Sky trilogy.

This lack of resources is why Ouroboros often relies on brainwashing and manipulation to recruit lower-level agents. An organization with options wouldn’t need to keep Gilbert around, after all! The Grandmaster glommed on to Osborne’s Great Twilight because she couldn’t stop it anyway and might as well keep a close eye on it.

Campanella pretended to be male so people with knowledge of the Mythos couldn’t figure out her game. The reason she is largely indifferent to human life is because she’s not a human and the whole situation is the humans’ fault to begin with. Sacrificing the few for the many is also a Mythos principle.

About Nayuta and Towa

Meanwhile, Nayuta’s parents who went down on a ship to the end of the world actually somehow managed to slip into Zemuria instead.

They couldn’t get back home, but had more children and named them following the same Asian cosmological scheme they used for Eartha and Nayuta. Nayuta’s dad, who was a scientist, founded a museum in Heimdallr. He also raised his granddaughter Towa after his children – Towa’s parents – were murdered in a terrorist attack and then turned his research to why people fight each other.

Nayuta isn’t Towa’s grandfather. He’s her grand (or great-grand)-uncle.