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Jona Sacred (ヨナ・セイクリッド) is a system engineer at the Epstein Foundation.


Jona was born in S.1191.

Since childhood, Jona has been attending special education for talented children at Epstein Foundation. This course is geared toward system engineering. Although Jona is naturally gifted, his grades suffer from his poor behavior.

Following a "prank" that ruined one of the Foundation's experiments and caused them to suffer severe losses, Jona left for Crossbell before he could be reprimanded, where he has been illegally occupying the terminal room of the Geofront until the Cult Incident in S.1204.


Jona lived in the terminal room, which served as his office to sell information and survived on pizzas he had delivered. He was very well aware that he was situated at the heart of the Orbal Network in Crossbell with access to documents regarding businesses and surrounding nations, and had to deal with another hacker, Kitty. He first met the Special Support Section when he was requested to send an e-mail in the name of Yin.

Jona was confident that the SSS would be unable to track him, as no one else had been able to. He failed to notice that Tio Plato was with the group, who was easily able locate him with her own skills. This in turn resulted in him being discovered, and he was worried that she would try to bring him back to the Foundation. He was relieved that she had no intention to do so, but was warned by Lloyd Bannings not to overdo it. Jona proceeded to give them a memory quartz, which Yin had instructed him to do should they find him.

Together with Tio, he returned to the Epstein Foundation headquarters in Leman. Jona worked hard to redeem himself at the foundation. In his absence, the terminal room had been taken over by Enforcer No. 0, Campanella, who had hacked into the system of the Orchis Tower at the time of the West Zemuria Trade Conference, which Jona had to restore the security measures. He installed the latest model of the terminal in the Orchis Tower itself, making it much harder to hack into.


Jona assisting the resistance alongside Tio Plato and Fran Seeker.

During the Imperial occupation of Crossbell, Jona made himself useful by lending his skills to the resistance.

Trails of Cold Steel IV

Jona continued to operate inside Geofront. Despite his "treasonous" posts, the Imperial authorities were unable to trace him. He was in contact with Scherazard Harvey and looked after by Sully Atraid, who would occasionally give him healthy food and drinks, much to his annoyance.

After new Class VII returned to Crossbell to search for the Occult Point, Jona took notice of their arrival and sent an orbal mail to Louise, telling them to meet him at Geofront Block X. The group found it suspicious, but choose to investigate further, seeing that he was aware of their identities. His lack of stamina caused him to lag behind severely and he ended up tripping after a run-in with Heiyue, forcing Ash Carbide to carry him out. He was unappreciative of Ash's efforts, comparing it to being dragged around like luggage.

The day before the World War, Jona went to Mishelam Wonderland, where Tio and Jingo had him record a special reserve show of Mishy for them. He complained about having to record a child's mascot show, but was quickly scared into compliance after Tio threatened to leak his past onto the Orbal Network if he ruined her day.

Character Notes

Trails of Cold Steel IV

Jona Sacred
Jona Sacred Note (Sen IV).png
Epstein Foundation
A boy who claims to be the greatest hacker who ever lived. Officially employed as a system engineer for the Epstein Foundation.
Elite Hacker
Determined not to be upstaged by KeA's powers, Jona is working furiously to access the government's confidential servers.
Got Your Back
Jona stayed behind at the Geofront to supply additional intel and support. For once, he's agreed to keep his activities strictly legal.

Jona Sacred Note (Sen IV).png


Zero and Ao no Kiseki


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