Originally from a big city, Futaba Ooki spends most days cataloguing her life through pictures on her phone. Upon moving to a seaside town, she gazes out over the vast expanse of sea and quickly becomes captivated by its endless possibilities. Unbeknownst to Futaba, her quiet contemplation catches the attention of local diving enthusiast Hikari Kohinata. Finding herself in the same class as Futaba the next day, Hikari is drawn to her quiet and shy demeanor and affectionately nicknames her Teko, sparking a tender friendship. Struggling to adapt to the change of pace in her life, Futaba finds herself strung along by Hikari's vast energy and passion for diving. Together, they join the school diving club, led by their homeroom teacher Mato Katori. With Hikari by her side, Futaba works to earn her diving certification while experiencing new friendships and possibilities.

Due to a careless mistake, god of wind Silphyleel unintentionally kills a 28-year-old man named Takumi Kayano. Unfortunately, Silphyleel cannot return Takumi to Earth. Instead, the deity reincarnates Takumi into the fantasy world of Etelldia. Equipped with an assortment of magical powers and bottomless inventory, Takumi spawns in the Forest of Gaia, where high-level monsters roam free. There, he meets five-year-old twins who, despite the dangerous environment, are still alive thanks in part to their extraordinary physical strength. Takumi decides to take them under his wing, naming them Allen and Elena. As the trio embarks on their grand adventure in Etelldia, their very existence may impact the world's destiny.

The duke, full of love and kindness, treads carefully around every living being, be it a tender flower or his seductive maid, Alice Lendrott. Were it not for the devotion Alice shows him and the fondness that grows ever stronger between them, the duke would have barely paid heed to his mother's demand: to either lift the dreadful curse placed upon him or lose his family inheritance. Although the duke has no greed for riches, he yearns to be rid of his frightful powers—which cause all he touches to die—for the sake of those closest to him. As the duke, Alice, and their friends enjoy spirited days filled with the ridiculous affairs of the supernatural, the spring deadline looms heavily over them. Nonetheless, the duke refuses to take any shortcuts in this endeavor if it means betraying the trust of his cherished friends.

Hundreds of years after the large-scale battle against the Nokkers in the city of Renril, the world is unrecognizable. Thanks to the immortal Fushi's efforts in dormancy, he has successfully created a world with modern infrastructure where he and every living species can live in peace. When he finally awakens from his slumber, Fushi is elated to try everything this new world has to offer and revive his friends from the past. While exploring, Fushi runs into Yuuki Aoki, a lively middle school student, who is quick to welcome him and his friends into the house. As the group settles into their new home and learns more about the modern world, Fushi meets Mizuha, Yuuki's friend, who resembles someone familiar to him. It turns out that Mizuha is the descendant of the Guardians: the people whose only goal is to keep Fushi safe. Like her ancestors, she grows fond of Fushi, which brightens up her life. However, as bizarre events occur when Mizuha approaches Fushi, it becomes clear that this new world is far from perfect.