Usugiri (a Touhou LW original) refers to a thin mist. It is the temperament of Suika Ibuki, who rules over the New Land of the Oni. Suika's original temperament of Metal Phase (strong against Earth Phase but weak to Fire Phase) and Moon Essence (strong against Sun Essence but weak to Star Essence) has combined with the king of the oni, Shuten-Douji's temperament of Earth Phase (strong against Fire Phase but weak to Wood Phase).

The ability of Suika Ibuki from the world of iron and steam (a Touhou LW original). Those who reside in the world where mountain resources are converted to power have formed their own unique civilization. Suika's ability doesn't appear to have changed much, but she seems to have used it extensively to establish the civilization she's a part of. Shuten-Douji spent her time relaxing with her companions and engaging in exhilarating fights with humans. She was happy. But everything changed on the night of the Battle of Mount Oe... But that's the tale of another world's Suika Ibuki. This Suika Ibuki woke up to see two oni before her, weeping with joy. It seems they had mistaken her for the oni, Shuten-Douji, on account of their remarkably similar appearances. Believing that Shuten-Douji was still alive was enough to make many an oni cry tears of joy. Seeing this, Suika resolved to act as this world's Shuten-Douji. She studied the land between Mount Ibuki and Mount Oe and learned all she could about Shuten-Douji. From then on, she completely fooled everyone into believing she was Shuten-Douji―even herself. The New Land of the Oni was long sought after by the oni and now provides a place where they can live in peace. The wonderful hot spring town and the hotel are well maintained, and everyone who visits wishes to stay forever. In a way, the town resembles the place Suika encountered those two weeping oni when she first came to this world, the peaceful city. Suika herself was the one who longed for a peaceful place to call home. In the long-forgotten depths of her heart, she dreamed of the day when she could become a true resident of this world. But that dream never became a reality. In the crevices of her mind, she doubted that the hot spring town was truly an ideal home. The town isn't governed by a committee but by the strength of a select few oni. In this case, strength doesn't imply violence. Using youkai power, they control the metal-production infrastructure, which allows them to adjust and improve aspects of the town, as well as combat natural disasters and catch criminals. Such things aren't possible for a regular town, but with the oni's spiritual civilization and steampunk―or rather, hot spring-punk design, they're more than possible here. The oni acquire metal via trades with the mountain's neo-humans (iron-making gods). Meanwhile, the hot spring hotel props up the town's economy by providing their guests with hot water imbued with ominous power that they draw up from the bowels of the earth.