Rimuru Tempest is victorious following his climactic showdown with Demon Lord Clayman. With Diablo's aid, the war with the Falmuth Kingdom ends decisively in Rimuru's favor. Fueled by increased migration and the integration of Jura Forest, the nation of Tempest undergoes rapid growth. Rimuru's victory shifts the balance of power, giving rise to a renewed period of peace—but whether that peace will last is another matter. Yuuki Kagurazaka and Kazalim are conspiring with the Harlequin Alliance to bring about Rimuru's downfall. Furthermore, the Western Holy Church continues its intolerant crusade against Rimuru and his non-human subordinates. Both allies and enemies engage in a battle of wits, carefully advancing their agendas without shattering the delicate status quo. But once the first domino inevitably falls, the race to supremacy begins.

Peaceful schoolgirl by day, fearsome monster slayer by night, Saya Kisaragi is leading a split life. Equipped with a ceremonial sword given to her by her father for sacred tasks, she vanquishes every monster who dares threaten her quiet little village. But all too soon, Saya's reality and everything she believes to be true is tested, when she overhears the monsters speak of a broken covenant—something she knows nothing about. And then, unexpectedly, a strange dog appears; it asks her to whom she promised to protect the village, curious as to what would happen if she were to break that promise. Tormented by unexplainable visions and her world unraveling around her, we travel with Saya through her struggle to find a way to the truth in a village where nothing is as it seems.

Thwarted again by Naraku, Inuyasha, Kagome Higurashi, and their friends must continue their hunt for the few remaining Shikon Jewel shards, lest they fully form into a corrupted jewel at the hands of Naraku. But Naraku has plans of his own to acquire them, and will destroy anyone and anything standing in his way—even his own underlings. The persistent, unyielding danger posed by Naraku forces Sango and Miroku to decide what is most important to them—each other or their duty in battle. Meanwhile, Inuyasha must decide whether his heart lies with Kikyou or Kagome, before fate decides for him. Amid the race to find the shards, Inuyasha and his brother Sesshoumaru must also resolve their feud and cooperate for their final confrontation with Naraku, as it is a battle they must win in order to put a stop to his evil and cruelty once and for all.

As the grand festival of True Cross Academy draws near, exwires and exorcists alike combine their efforts to banish any demon that threatens the celebrations. Among them, Rin Okumura is tasked with exorcising the soul-devouring demon known as the Phantom Train alongside his brother Yukio and Shiemi Moriyama. During their mission, the Phantom Train escapes its tracks and begins ravaging True Cross Academy. In the ensuing chaos, Rin encounters a childlike demon he dubs Usamaro, and begins to develop an odd friendship with it. However, Usamaro's abilities might be far more sinister than Rin initially expected.