Jusis enrolled in 토르즈 사관학교 in order to escape his suffocating family life. His first encounter with 마키아스 레그니츠 ended horrifically and managed to ruin his normally composed attitude. The fact that he sneers at the ridiculous nature of commoners obsessed with their hatred for nobility seems to add fuel to the fire.
Over the course of his first year at Thors, he frequently irritates commoners such as Machias and Paula, who genuinely believe that he thinks he is better than them. However, this disrespectful behavior is not due to any belief that his position as a high-ranking noble makes him superior to others.
After the field study at 켈딕, Jusis apologizes to his classmates for the trouble his father caused them after it was revealed the provincial army was supporting bandits in vandalizing the city's market stalls.
During the field study at 바레아하트, Jusis ends up in a squabble with Machias over their combat link after defeating a monster, which had enough strength to attack and injure Rean. Jusis knew that the situation was Machias' fault and not his, and silently waited for his response. The following night, Jusis explained to Rean that he had unusual life circumstances which Rean shared, causing the two to build a supportive relationship with each other. Machias, overhearing that Jusis was not a full noble, apologized to him in the morning, which he accepted. Helmut later had Jusis taken away while he had his men arrest Machias to blackmail his father, Carl. Jusis, having newfound respect for Machias after he admitted his mistakes, chose to help his classmates and free him.
When Millium enrolled in the class in 18 August S.1204, her overly affectionate attitude towards him left him completely exasperated.
At the start of the civil war, Jusis initially fights alongside his classmates, but after the group temporarily separates ways, he returns to Bareahard, working for the 귀족 연합 due to his father and brother working with them. Upon hearing of his classmates' arrival in the area, he discreetly leads them to the airport and tries to persuade them to leave him, to no avail. Rean eventually manages to convince him to join after besting him in a duel, leading him to realize that he cannot accept his family's wrongdoings. As a result, he chooses to run away from home in order to rejoin his classmates and find a way to end the civil war.
After hearing that his father had the town of Celdic razed for refusing to follow him, Jusis, along with his classmates, confronts his father. After several brief skirmishes on the way, he personally arrests him for his crimes against the people. As Rufus was still working with the Noble Alliance, Jusis served as an interim lord and ordered the region's provincial army to stand down.
Jusis ends up holding the position permanently after learning that Rufus was actually a member of the 철혈 and was made governor-general of Crossbell Province. He is planning to reshape the 바레아하트 region. Behind closed doors, he has been staying in touch with the other Great Houses as they increase their pressure. He tasked the family butler Arnauld with overseeing the province as much as he could on his behalf.
During the 검은 성배 incident, Jusis confronted Rufus and learned from him that they were actually cousins. He also learned of Millium's apparent death, which greatly saddened him. He was somehow able to obtain her hat before he was teleported to Eryn village. After New Class VII woke up, Jusis attempted to offer her hat to Altina, but she refused to accept it, so he kept it with him. While working with his former classmates and the new Class VII, Millium revealed that she was still alive in the sword, which comforted him.
During one of Rean's bonding events with him, Jusis returns to Bareahard to deal with accumulated documents that Aranauld had been unable to process. He also retrieved the Holy Sword of Elvars (聖剣エルヴァース), knowing that a confrontation with Rufus would be inevitable.
Before the 요르문간드 전역 started, Jusis spent some time with Millium at 미슐람 원더랜드. Jusis later fought alongside Rean and Crow against Rufus and watched as his cousin lost the Rivalry against Rean and Valimar. Although he forgave Rufus, he condemned his earlier actions and knocked him out with a single blow.
When Millium's soul was transferred from the Sword of the End to a spare backup body, Jusis immediately hugged her alongside Altina, happy to have her back. He later attended Olivert and Scherazard's wedding.
In the aftermath of the World War, Jusis learned that Rufus had broken out of prison and forcefully seized Crossbell to establish "the United Nation of Crossbell", much to his surprise and disgust.
He went to Heimdallr with Millium in order to investigate mysterious companies that were buying bulk goods for no apparent reason. He met with Rean, learning from him that he had arrived to the city after a masked person was going to target the "muck and mire" underneath the city. The group then encountered the masked person's party and gave chase underneath the catacombs. During the pursuit, they discovered the bulk goods that Jusis had been trying to locate, along with rebels that attempted to instigate a new war. He was shocked to see that the masked person was actually Rufus and tried to question him to no avail.
Eventually he learned that the Rufus in Crossbell City was a fake and assisted his cousin and adoptive brother in removing the imposter. When Rufus stepped aside to destroy the Retributive Tower at the cost of his own life, Jusis accompanied Lloyd and Rufus' group to rescue his cousin. He was worried that Rufus would die from his injuries, but Rufus made a full recovery. Jusis was relieved to see Rufus well, albeit upset at how he worried him greatly.
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