It's taboo for humans to kill one another, so Hiroshi wishes that he could let go of his sword and everyone would be saved. He also wishes that the sun would return and that the darkness would stop. He says that he's going to bring back Mashioro's soul, which is in yomi, not in the forest fire. Even if he can't go to the forest to save one person, he'll still be able to help everyone else because the kami are so good at making people happy.