Senkuu's plan to uncover the source of the green light that once petrified humanity is moving forward as brains and brawns join forces. Yet, the next step requires a ship to take them to the other side of the world. Luckily, Tsukasa Shishiou's former underlings help assemble the base of the ship in no time, but the crew realizes they need a skilled captain. After finding a petrified Ryuusui Nanami, a renowned expert in sailboats but with an unpleasant personality, Senkuu takes a risk and revives him. Despite Ryuusui's eagerness to claim everything for himself in this new civilization, he must join forces with Senkuu to find oil, the king of fuels, before taking on the crucial role of the ship's captain.