Gran and company move on to a secret factory in pursuit of a clue to the missing Archduke Tzaka. Lyria says she hears a voice calling out to her and leads the group to the deepest recesses of the location, where the archduke and an iron giant await.

Gran and company set off for the Valtz Duchy. Siero introduces them to a Valtz Duchy “special operator,” who asks them to search for the missing Archduke Tzaka, the most powerful person in Valtz. They take the job and begin investigating right away, but someone is following them...

Thanks to his skill as a helmsman, Rackam navigates the Grandcypher to the mass of dark clouds, where Tiamat is waiting for them. Gran and his comrades must face this great primal beast to save the Port Breeze Archipelago and its guardian deity.

Gran and company are under fire and trapped by Imperial Army General Furias, who intends to recapture Lyria. However, Rackam, the helmsman, gives them a way out. They propose hiring him as a helmsman to get them off the island, but he refuses and tells them he doesn’t want to fly unless it’s with the Grandcypher, the old airship that has captivated him since he was young.

Gran and his party depart Zinkenstill for their goal, the Island of Astrals. However, Katalina crash lands the small airship on a nearby island, Eingana Island. A man named Rackam happens to witness their totaled aircraft. The townspeople consider Rackam an oddball for the way he’s always working on repairing a certain airship that has no chance of ever flying again...

Gran dreams of his youth, remembering the words his father left in a letter - "I will be waiting at Estalucia, Island of the Astrals." He awakens to find Lyria at his bedside, happy to see him well after the incident with Pommern and the Hydra. Katalina and Lyria explain to Gran the situation he now finds himself in, and that he must now make the bold action to journey with them.

Gran and Vyrn live on the sleepy, far-flung island of Zinkenstill. Their quiet lives are rocked by the sound of a sudden explosion and the sight of battleship in the sky. They follow a light that falls from the battleship into the forbidden woods, where they encounter a mysterious girl.

Resupply and damage control turns into mutiny when a planet is discovered that’s seemingly a valid alternative to Earth.

The protest instigated by the Byakuya Gang against the Kaminarimon Company increases in intensity. The Leaf Shinobi, including the genin, are mobilized into action. The teams are assigned sections to keep watch over the protesters, and Team 10, made up of Shikadai, Inojin and Cho-Cho, takes up its position. But Shikadai notices something as he studies the position chart and rushes out on his own!