Boruto and the others are stranded in the middle of the ocean due to the ship being damaged. Luckly, they are found by the shipbuilders, Kajiki and Ikada, who are willing to tow the ship to their island to help repair it. 

Ikada's older sister, Seiren, goes to the shipbuilding island to bring her little brother back to the Funato clan. However, Ikada refuses because he wants to learn much more about shipbuilding.