After leaving her idol career behind, Fuuka Miyazawa finds herself on a spontaneous flight to Okinawa instead of returning home to her pity party in Morioka. Bearing a heavy heart and nowhere to go, she aimlessly wanders around the area until she stumbles upon Gama Gama Aquarium—an aging aquarium on the verge of closing down. With a lack of visitors and costly but necessary repairs needed to keep its doors open, the director is faced with shutting down the establishment for good by the end of the summer. The director's aquatic life-loving granddaughter—Kukuru Misakino—cannot stand the thought of the aquarium closing and is determined to make enough money by the end of the season to keep the doors open. Seeing the unique magic of the aquarium, Fuuka begs Kukuru for a job; however, she soon finds that her lack of experience makes her more of a hindrance than anything else. At the same time, Kukuru realizes that her ambitious goal might be more than she can handle. With mounting pressure from all around them, will Kukuru and Fuuka be able to save the one place they hold close to their hearts?

Whether it be facing misogynistic remarks from her boss or being pressured by condescending co-workers, stress is just another part of the job for 25-year-old red panda Retsuko. Despite being one of the most diligent workers at her office, her diminutiveness and modesty often lead her to be exploited by her colleagues. However, when her irritation hits the limit, Retsuko brings forth her unique brand of letting off steam: aggressive death metal karaoke bashing the idiocy and hypocrisy of her co-workers' actions and work life. Although this venting only takes place in her mind, it gives her an outlet to counter her frustration in a world where hierarchy and appearances reign supreme.

Eight-year-old Pride Royal Ivy suddenly recalls her former life as a fan of the otome game Our Ray of Light. While on her way to replay it, she tragically died, reincarnating as the game's final boss and firstborn princess of Freesia. Her knowledge of the game's events leads everyone to believe she has the power of precognition. But unlike the game's original princess, this new Pride does not wish to torment those around her, such as her younger sister and adopted brother. Haunted by nightmares of her other self's atrocities, Pride resolves to protect her family and country while progressing the story. As the world around her changes, she prepares for the day she will have to die at the hands of the game's main characters. Nevertheless, before that happens, Pride will either transform her kingdom for the better or fall under the weight of her possible crimes.

Drift peacefully into Neo Venezia, a city on the planet Aqua (formerly known as Mars). By the 24th century, humans have found a way to colonize the previously uninhabitable planet. As futuristic as that sounds, Neo Venezia is still teeming with rustic beauty; gondolas on wide canals and waterways are the main mode of transportation. The city itself is a faithful replication of Manhome's (the planet formerly known as Earth) Venice. To make sure that residents and tourists alike get the most from Neo Venezia's many wonders, companies offering guided tours via gondola were formed, one of which is named Aria Company. This is the workplace of Akari Mizunashi, a free spirited teenager from Manhome who is now a novice Undine (the title given to tour guides). Join Akari as she becomes intimately acquainted with other Undine, tourists, Neo Venezia's residents, and even the city itself, learning many valuable life lessons along the way, such as the wonderful truth that there are such things as manmade miracles.