Ryōichi Torigoe became a navigator with the thoughts of his deceased grandmother in his heart. He is immediately baptized as a navigator by his senior, but on his ship there is a fierce battle between two factions over who will be treated in heaven and hell. The territory is not satisfied with the idea of ​​the same sailors fighting each other, but then a war suddenly begins where the ship is heading. Sailors are forced to decide whether to proceed into dangerous waters in a state of war. As they are about to fall apart, the city throws a plan that will take advantage of their territory! What will happen to Ryoichi and his friends? A masterpiece of human drama depicting the struggles of Ryoichi, the hot-blooded protagonist with a burning sense of justice!