From a young age, Fortuna was not very comfortable living with his parents. Instead, he trained under the spirit-master Rei, who was the only person who understood his intellect.
One day after his lessons with Master Rei, he experimented and created the artificial spirit Rune. This resulted in his former master banishing him. Upset by this, he created his own research lab, and took in his friend East as an apprentice. Over the next several years, Fortuna trained him in the art of spirits.
One snowy day, East discovered a young child who had been nearly killed by wolves. Although Fortuna refused to take care of her, instead making East do it, he decided to name her Koko and eventually made her his apprentice when she was old enough.
Fortuna, East, Rune, and Koko were happy together, like one large family. However, this all came to a halt when East began developing the same disease that had previously killed Master Rei.
His attempts to save East led to the creation of the first spirit circle, which Fortuna then charged with power from the spirit forges. This resulted in the forges collapsing, killing many innocent people. When Koko confronted him about this, he appeared disconnected and unremorseful, as he saw East's life as more important than hundreds of strangers'. He then proceeded to separate East's spirit from his body as a means of preserving his consciousness beyond his imminent death.
After 'saving' East, he fled with Rune, East, and Koko in order to escape capture. After arriving at a port town, Koko realized that Fortuna has no regard for human lives other than those around him. She then took the spirit circle and left with East, in the process attracting the attention of the guards. Fortuna is then forced to flee with the aid of Rune.
Fortuna began traveling from city to city, evading capture by spreading misinformation about his physical appearance. During this time, he produced another spirit circle, reusing some of the energy from the previous one. He is eventually confronted by city guards, and used the spirit circle to raise the undead to kill them. After deciding to use this power to take the city for himself, he secluded himself in the library to study the 'ancient civilization.'
He devoted all his time to his study, so much so that he lost track of time until Koko appeared before him again, having fought her way through the city in order to kill him. Not having much grasp of the situation, Fortuna conversed with Koko as if nothing had happened. After proposing that they live together once again, he began excitedly talking about his discoveries. He also revealed his plan to use the spirit circle to absorb the Earth's energy, becoming space itself and gaining the ability to traverse 'worlds of other possibilities and space-time values.'
Deciding that Fortuna still showed no remorse, Koko attempted to kill him once more, but he fled with his reanimated soldiers. As he fled, he encountered East, who expressed sadness and disappointment in what Fortuna has become and done. Fortuna recognized that there's no going back to what they once had, and began making his way towards the Basin of Darkness.
After arriving, Rune lamented about what Fortuna has become. As he admitted that he can no longer change himself, Fortuna revealed that the spirit circle allowed him to peer into his future incarnations. As he experienced each of their lives, he realized that in Okeya Fuuta's lifetime, Kouko will destroy his spirit, putting an end to his cycle of rebirth. While he dismissed it as only a possibility, he remained perturbed, and decided to work toward his goal of becoming a god.
Coming forward, Fortuna summoned the Subspace Shelter, a device from Lafalle's time. He used it to send a message to all of humanity, stating that they must resist him, or every living person will be turned into an undead soldier.
Gathering with an army of soldiers, Koko faced off against Fortuna. He attempted to envelop the world with his spirit circle to consume it, but Koko resists it with her own. After a fierce struggle, the planet's spirit, Spascifica, ultimately repelled Fortuna's attack.
Frustrated, Fortuna then leapt to attack Koko. In the ensuing fight, they strike fatal blows on each other, but fail to destroy each other's souls. In the process, Fortuna's spirit circle absorbed a tiny piece of Koko's soul, connecting their fates so that their relationship would be recreated in subsequent lives. He then told Rune to take his spirit circle, and wait in his spirit dimension, and told East to do the same with Koko. As he toppled into the basin, Fortuna planned to change the future he previously saw, and dies.
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