A decade ago, a volcanic eruption pushed Japan's Ayaka Islands to the edge of ruin. Since that time, Yukito Yanagi has resided with foster families on the mainland, yet he has withdrawn from society after a troubling incident. Acting on the final wishes of his deceased father, Makoto, Yukito returns to his hometown on the day of his middle school graduation. There, he encounters Makoto's disciples and learns about the region's supernatural nature. The islands are home to mysterious life forms called Mitama, but their ability to feed on humans' negative energy and transform into savage monsters known as Ara-Mitama threatens the lives of the islanders. Yukito finds out that, just like his father, he is a Ley Master—a unique individual possessing abilities similar to magic, charged with calming the Ara-Mitama. As he works to conquer his trauma and master his powers, Yukito resolves to follow his father's path and become a top-tier Ley Master to safeguard the peace of Ayaka.