Hatsunejima abounds in mysteries—one of which is the town's unwithering cherry trees that are said to grant the most genuine wishes. There are also rumors of people possessing supernatural powers, like Junichi Asakura, who can see other people's dreams and create sweets out of nothing. Alongside his sister Nemu, he enjoys living in peace with his friends at Kazami Academy but chooses to shroud his identity in secrecy. His tranquil school life comes to a halt when he finds out that his childhood friend Sakura Yoshino has returned from America after six years. She is there for one purpose: to fulfill the promises she made long ago with Junichi. Little does anyone know, however, that Sakura's appearance is bound to change everyone's lives—for better or worse.

Back in middle school, Arisu Yamabuki's only solace in life was a radio show hosted by a girl named Apollo. He used to faithfully tune into the program every night until she abruptly stopped broadcasting entirely. Despite having very few clues about Apollo's identity, Yamabuki has thoroughly investigated her, which eventually led him to enroll in the newly co-ed Furin High School, hoping to find her there. Just as Yamabuki suspected, the broadcasting club's first announcement is made by the familiar voice he admires! Upon entering the club room, however, Yamabuki realizes that his search will not be that easy. The four members—Rikka Inohana, Shinobu Uzuki, Nene Himekawa, and Iko Kirino—all sound like Apollo in different ways. Yamabuki joins the club primarily to find Apollo, but he soon discovers that each girl aspires to pursue her own career with her voice. Seeing that there is a lot of room for improvement, Yamabuki takes it upon himself to help the girls reach their individual goals—but he never stops looking for his favorite Apollo.

Crimson Denizens and Rinne, beings from a parallel world, seek to devour humans' precious existences. To restore the delicate balance of the world, Flame Hazes hunt these entities down. Yet such things are unknown to Yuuji Sakai, who starts his day like any other and heads to school. His day, however, takes a turn for the extraordinary when he witnesses everyone around him freeze in place and is left the only one able to move. Immediately, a Rinne begins devouring the souls of those around him, but as the creature sets its sights on Yuuji, a katana-wielding Flame Haze with blazing red hair saves him. After his protector fixes the damage done, she explains why Yuuji was able to move: he has become a Torch, a remnant of a dead human being that will eventually fade from memory. Furthermore, he is also a Mystes, a Torch that houses an unknown treasure. Before his flame burns out completely, a Crimson Denizen will try to seize the treasure he holds, so the fiery hunter decides to watch over him. As Yuuji comes to terms with being dead, he resolves to live his life the best he can with the time he has remaining.

Akane Nishimura's quiet nature makes her classmates perceive her as a gloomy and unlikeable person. Combined with her intimidating gaze, it earns Akane the ominous nickname Grim Reaper, condemning her to endless bullying for her supposed cursed powers that bring misfortune to everyone around her. However, none of these rumors deter transfer student Taiyou Takada from trying to befriend Akane. As someone who finds the supernatural fascinating, Taiyou approaches the Grim Reaper without hesitation, blissfully unaware of the complicated situation within the class. His bright personality and optimistic worldview may just bring about the change that Akane desperately needs.