When Rean boarded the Noble Faction's flagship Pantagruel, Alfin gave him advice that helped him learn to control his ogre Form, allowing them to escape the clutches of the top warriors of the faction. She was later brought back to the Courageous as her personal ship and reunited with her half brother Prince Olivert Reise Arnor. Princess Alfin became the voice of Class VII and Thors Military Academy students in the civil war, where they were assigned to counter the Noble Faction in the Eastern Erebonia.
After the Erebonian Civil War, Alfin graduated into the high school of St. Astraia Girls' School but is burdened by anxiety over the sudden change of her twin brother Cedric, and the cold way her older brother Olivert and the Vander Family are being treated. Because of this discomfort, she postponed her debut into high society for another year to find a suitable partner for her entrance.
Alfin is still beloved by the Erebonian populace and even gains support from the inhabitants of annexed territories. She attends the Imperial Inspection in Crossbell and even tries to help out when Ouroboros enforcers attack, before being persuaded not to by Rean.
She later makes her debut into society at the party in Valflame Palace's Esmelas Garden after the operation to find Calvardian agents in the city before the Summer festival is concluded. So as to not give society the wrong idea, and to help Elise out, she and Elise both invite Rean to be their first dancing partner.
Following the start of the Great Twilight, Alfin was separated from her mother and was initially supposed to be sent to Saint-Arkh under Wilhelm Ballad's custody with Tita Russell, but was diverted to Dreknor Fortress where they were placed under the custody of the Fourth Armored Division.
Rean, who had returned to normal by this time, along with Class VII, found and retrieved her and Tita from the fortress. Alfin later reunited with Elise at Thors Branch Campus.
Following the end of the Great War, Alfin worked alongside Olivert to restore the public's trust to the royal family when it was revealed that Cedric had willingly supported Osborne.
Alfin resumed her normal public affairs. When Rean and his party come to Heimdallr, Governor Carl Regnitz requests a meeting in the Der Himmel Hotel, where he is accompanied by Alfin. She decided to get involved after a discussion with Governor Regnitz because the case involved her brother. They talk of the new 'C''s identity, but the conversation soon turns to the main order of business. Alfin has heard from her contacts at the Girls' school that some elements of the military have been acting strange. After the meeting it is agreed that rest is part of her duties, and she heads back to Valflame Palace.
The crown jewel of Erebonia as its adored princess and a student at St. Astraia Girls' School. She has developed deep bonds with new and old Class VII.
As a Friend Alfin fully supports Tita during Professor Russell's challenge, proving their friendship to be dear and true.
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