Cooperate in the major remodeling of the hero and demon king's workplace On the night that Maoku and the others start living at the beach house run by Daikoku Tenne, fog covers the Kimigahama area. Ashiya confirms a large figure in the fog, but it turns out to be the demons of the demon world, Cyclops and Beast Demonoid, who were seriously injured. On top of that, the demon lord Kamio, who was leading them, also appears with serious injuries. Why are there demons in Choshi, and what is lurking in the fog? Dawn dawns while the mystery remains, the day the sea opens. The battle between Maoku and his friends was about to begin at the Umi no Ie.