For more than four hundred years, the Takamimi Shrine has stood in Tokyo, enshrining the local goddess: Elda, a magical elf summoned from another world. The immortal elf has been served for 15 generations by the family who summoned her in the Edo period. Now, after Koito Koganei turns 16 years old, this responsibility falls onto her. Serving as Elda's shrine maiden, Koito must balance her responsibilities with her daily school life. This proves to be difficult because Elda is a total social recluse who loves video games, collecting toys, and eating snacks. In an effort to get the lazy shut-in to experience more of the outside world, Koito juggles her time between indulging Elda's various hobbies and getting her to interact with the rest of humanity. Along the way, Koito learns more about the history of the area and what makes the goddess so loved and spoiled by the locals.

Since childhood, Hiyori Yamakawa has witnessed her father's various eccentricities, but one activity she has always loved doing with him is fly fishing—a complicated yet rewarding method of catching fish. Even after his sudden death, Hiyori still visits the seaside in her spare time, savoring the joy that her father's memento brings her. Three years later, Hiyori's mother decides to remarry and arranges a dinner with her fiancé, his daughter, and Hiyori to celebrate. Anxious and wanting to pass the time, Hiyori goes to her usual fishing spot when a rather energetic girl named Koharu Minagi suddenly appears before her. The two soon become acquainted, with Koharu taking an interest in fly fishing herself. However, their meeting is more than just a coincidence: Koharu turns out to be Hiyori's future stepsibling, which is only the beginning of treasured memories the both of them will reel in as they foster their sisterhood.

After a strategic maneuver, Senkuu Ishigami's team stalls Dr. Xeno's more scientifically advanced forces. A ceasefire between the two factions allows for the establishment of Corn City in North America, a hope for a future thriving population. Meanwhile, Senkuu and some of his teammates rush toward the Amazon in South America—the epicenter of the petrification beam's impact—to create Superalloy City and progress their spaceship project. With dangerous enemies still pursuing Senkuu and his companions, it is a race against time to reach the heart of the dense Amazon. As unexpected allies and scientific creations further fuel this leg of their journey, Senkuu is closer than ever to finally uncovering the mystery behind the petrification phenomenon.

After graduating from high school, Mai Kawai's top priority was to find a job with a stable income to avoid turning out like her father. However, despite having taken a variety of civil service exams, she was faced with a harsh reality: nearly every institute denied her entry. The only place that accepted her was a police academy, which she reluctantly joined. Even now that she is an actual police officer, the world continues to be cruel to Mai. Due to her profession, she unexpectedly receives constant criticism from disgruntled citizens. Disheartened by the hostile treatment, she decides to submit a letter of resignation after just a few months of employment. But on the same day Mai chooses to quit, she meets Seiko Fuji—the former ace of the Criminal Affairs Division who is assigned as her new instructor. Finding her new coworker to be enchanting, Mai delays leaving and gives her uninspiring job a second chance.