Lillia, Allison and Treize leave Princess Matilda to be escorted by Travas and his professional staff. Matilda's train is attacked and a fierce struggle takes place. Lillia is kidnapped, and Treize and the others face a desperate situation.
With dynamite in hand, Treize and Lillia head to rescue the hostages taken by the unknown fighters. The leader of the fighters, Clair, forces Fiona and Benedict to tell her where the "Treasure of Ickxtova" is hidden.
While Fiona and Benedict have a New Year celebration, unidentified armed fighters seize the palace. A palace guard manages to escape to break the news to Treize and Lillia. The snow storm hinders any attempt to rescue the hostages.
Treize successfully maneuvers the airship to land on a lake. Lillia and Treize bid farewell to Carlo and the children. Travas reveals to Treize the real mastermind behind the plot to shoot down the charity airship.
Lillia, the daughter of Allison and Will, is now 15 years old. She is in her third year at the prestigious senior school in the capital. Just before summer break, Treize, her childhood friend from the Ickx Kingdom, comes for a visit.
Mr. Terror, a chief player in Loxie's military industry, receives a threatening letter. At Major Stork's urging, the team cuts Mr. Terror's car from the train and heads down the hill. They are soon under attack by the Sou Be Il army.
The happily reunited friends continue their trip on the luxurious train. Things go awry when the conductor is found murdered. The murderer is somewhere on the train! Allison, Will, and Benedict decide to hunt him down.
The people are skeptical about Fiona's declaration that she is the princess of this kingdom. For the first time, the truth about the assassination of the royal family and who was actually behind it is brought to light.
Will is in the Ickx Kingdom for Winter break. Upon his arrival, he is kidnapped by a group of burly men. The culprit....is Allison! Reunited, the duo begins their first mission in Ickx, and they find themselves in a blizzard.
Having heard that Allison and Will are after "the treasure that could end The War", Benedict must decide where his loyalties lie. Meanwhile, the men plotting to snatch the treasure from them are also closing in.
Allison and Will infiltrate the Royal Army base where the old man is being held. As fate would have it, a pilot officer who knows Allison is also stationed there. The two attempt an escape with the old man, but enemy forces stand in their way.