With a smirk, Oota disregards his single-digit test scores and searches for a new source of amusement. He is soon captivated by his classmate Kashiwada, a mysterious student who consistently wears a blank face. Oota conspires to break her placid demeanor through scares and mischievous schemes, though his tactics always seem to backfire. Oota is known as the class clown and is constantly disciplined by his teacher, who claims his face gives it away. To no fault of his own, he lacks control of his emotions and facial expressions. Kashiwada, on the other hand, seems perpetually emotionless and unreadable—no one knows what she is thinking! Oota and Kashiwada are complete opposites, but that does not stop a unique relationship from developing between them. As they realize their feelings for each other, it raises an important question: do opposites really attract?

Alma, an autonomous self-learning robot with advanced combat capabilities, was created by two genius scientists, Enji Kamisato and Suzume Yobane, who developed Alma's artificial intelligence and robotics, respectively. After being mocked by their former acquaintances, the duo have worked together in order to show the world their true talents. But even though they cooperate in their work, the two scientists cannot seem to get along in their personal lives. However, despite their constant bickering, Enji and Suzume develop a glint of mutual affection—feelings that do not go unnoticed by their adorable robotic creation. Now curious, Alma starts to question the true nature of her creators' relationship. As she learns more about humanity from those around her, Alma's bonds with Enji and Suzume only grow stronger.

It has been six months since Yoshiki Tsujinaka's best friend, Hikaru Indou, went missing in the mountains and returned a week later with no recollection of what had transpired. Certain that it is not the Hikaru he knows who came back, Yoshiki finally asks Hikaru about it. Suddenly, Hikaru reveals his true monstrous form and begs Yoshiki to keep it a secret, as he does not want to kill him. Despite his paranormal nature, Hikaru seems almost innocent, full of childlike wonder and eager to experience the summer heat, the countryside, and all kinds of other things in a human body for the first time. And for Yoshiki, it matters little if Hikaru is a fake relying on stolen memories—as long as he never leaves again. As Yoshiki desperately clings to Hikaru in his intense grief, it becomes increasingly clear that something dangerous and supernatural may have descended from the mountains into their village.

After surviving the entrance exams, Sakuta Azusagawa has finally enrolled in the same university as his girlfriend, Mai Sakurajima. He is gradually getting used to the unfamiliar environment as he attends student gatherings and makes new acquaintances. Everything seems to be going smoothly until Sakuta's friend and Sweet Bullet idol group member Uzuki Hirokawa begins acting out. With fellow Sweet Bullet member Nodoka Toyohama pleading for his help, Sakuta realizes that he has stumbled upon another case of the inexplicable Puberty Syndrome—Uzuki is feeling pressured by the sudden surge of popularity and rumors of a potential solo career. While Sakuta searches for a solution, another occurrence of Puberty Syndrome gradually emerges from the shadows.