Four members of the Din Republic's spy team Lamplight embark on a mission to capture an enemy spy. Although they struggle to work together due to their clashing personalities, Thea, Monika, Erna, and Annett complete their objective. While enjoying a short break, the four girls encounter a woman named Matilda, who claims to be Annett's mother. As they get to know Matilda, the team is dragged into an escalating conflict that tests their teamwork and allegiances. Meanwhile, the remaining Lamplight members notice that the dispatched squad has yet to report back. Worried about their allies, Klaus and Lily set out on an emergency expedition to locate their missing teammates. As the two uncover troubling information about rising tensions in the area where their friends last were, they must act quickly to reassemble the team before the mission reaches the point of no return.

Ten years ago, a volcanic eruption brought Japan's Ayaka Islands to the brink of destruction. Since then, Yukito Yanagi has lived with foster families on the mainland, but he has isolated himself from others following a disturbing incident. Due to the wishes of his late father, Makoto, Yukito is brought back to his birthplace on the day of his middle school graduation. There he meets Makoto's disciples and learns of the supernatural state of the region. Mysterious life forms known as Mitama inhabit the islands, but their potential to feed off humans' negative energy and turn into ferocious monsters called Ara-Mitama endangers the islanders' lives. Yukito discovers that, like his father, he is a Ley Master—a special individual with abilities akin to magic, tasked with pacifying the Ara-Mitama. As he learns to overcome his trauma and control his powers, Yukito decides to follow in his father's footsteps and become a first-rate Ley Master to protect the peace of Ayaka.

Filled with rage against spirits known as tsukumogami, Kunato Hyoma is sent to live with Nagatsuki Botan to help him see a different side. Though both are part of a clan that return the spirits back to their world with divine powers, their experiences with the otherworldly vessels are vastly different. Kunato, robbed of a loved one, and Nagatsuki, saved by them. Can she get through to him?

After the climactic battle to decide the fate of humanity, the hero Max, alongside his party, emerges victorious against the formidable Demon Lord. As he draws his last breath, the defeated Maou vows to return more powerful than ever to take his revenge. Ten years later, although Maou has resurrected, the process is incomplete, resulting in him taking on the form of a child. Nevertheless, not wanting to waste another second, Maou pays his nemesis a visit—but the hero who once gallantly protected humankind from the demon's clutches is now a pitiful slob bearing no resemblance to a man of his former caliber. Despite his disappointment, Maou moves in with Max in hope of building him back up into a worthy adversary. But as the demon learns more about the events that transpired in the decade of his absence, he realizes that there is a story behind Max's downfall that he knows nothing of.