Vanitas and Noé Archiviste head out to the town of Gévaudan in search of the "Beast," an enormous wolf-like creature that has slaughtered hundreds of people. Suspecting that the Beast is a curse-bearing vampire, Vanitas primarily aims to heal it using the powers of his grimoire. Along the way, the two get separated and suddenly travel back to the past—to the exact moment the Beast is lurking in the woods. After a battle against the gigantic wolf and a vampire hunter, Vanitas decides to team up with Jeanne in order to find Noé. Despite being allies, Jeanne's goal is the opposite of Vanitas', as she was tasked to kill the Beast—suspecting it may be someone she used to know. Meanwhile, a severely wounded Noé is picked up by the mysterious Chloé d'Apchier and her servant. Like Noé, Chloé is a vampire whose existence was erased from the public's knowledge. She has been a guardian for future generations and once tried to find a way to become human again. While Noé is grateful to Chloé for her hospitality, little does he know that she might be siding with forces far more dangerous than the Beast itself.

Haru Nabatame, Rio Seibu, and Kyouka Tamaki's idol unit, TiNgS, is on the verge of disbandment. However, if they can fill all two thousand seats in their upcoming anniversary concert, their idol careers will live to see another day. This quota is seemingly impossible for a group like them, especially when the most people they have had at a show is 37. Fortunately, they are placed under a new talented manager—Naoki Hinase. While initially reluctant due to past experiences, Naoki takes charge of TiNgS after sensing Haru's genuine passion for idols with his own remarkable ability to see the shine of someone who is lying. Despite the challenges she faces in this ambitious endeavor, Haru wants everyone in the world to love idols, even willing to become the shining guidepost—shine post—to accomplish her dream.

Bayron City, a pioneering metropolis built on a newly discovered energy source, promises every citizen a luxurious and comfortable lifestyle. In reality, young demon exterminator Shuu Ogata's life is far from extravagant. Despite running a private military business, he often struggles to make ends meet due to reckless expenses. Fortunately, Kisara, his demon partner, is more than eager to help Shuu with household matters—albeit a little too forcefully for his comfort. The two work side by side, taking countermeasures against demon hazards, which stand as the biggest threats to the city. With danger lurking in the shadows, Shuu and Kisara strive to grant the town's safety; however, exterminating the possessed comes with a price unbeknownst to others.

Himari Kino is a cheerful and outgoing girl who is able to make friends with anyone she wants. When she enrolls in high school and attends the freshman opening ceremony, Himari falls in love with Yori Asanagi, a reserved upperclassman, during Yori's band performance. After the show, Himari blurts out her love, but Yori is inexperienced when it comes to romance. Yori, who did not expect this outcome at all, looks for answers from her friends and music. She decides to respond to Himari's confession, and to her surprise, Yori discovers that Himari fell in love with her music and performance rather than Yori as a person. Despite the shock, Yori desires to make Himari truly fall in love with her. The duo spend time together after school on the rooftop, where Yori usually plays her guitar with hopes to change Himari's feelings for her.