Hajime Shinonome is a 29-year-old seasoned adventurer who has long stepped away from the glory of youthful ambition, instead content with his steady life in Komai Village. During a dungeon expedition, he rescues a young girl named Rirui, who was abandoned and nearly consumed by a slime. Driven by memories of a similarly unforgiving past, Hajime takes her under his care. But as Rirui begins to reveal unexpected abilities while adapting to the rhythm of village life, Hajime finds that their shared existence may prove to be more consequential than any other quest he has ever attempted.

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.

As a romantic comedy enthusiast, Yonosuke Eiyuu Sakai enjoys the stories about childhood friends the most. But he solemnly believes that the flawless, loving childhood friends from his stories exist only in fiction. Though he has two childhood friends of his own—Shio Minamo and Akari Hiodoshi—Eiyuu has never seen either one of them as anything more. However, now that they are all in high school together, the beauty of the two girls begins to catch Eiyuu's eye. As his interest subtly grows, the girls start to make advances toward him regardless of time or place—but only time will tell if Eiyuu will ever overcome his denial and finally see the girls in another light.

Barely surviving in a barrel after passing through a terrible whirlpool at sea, carefree Monkey D. Luffy ends up aboard a ship under attack by fearsome pirates. Despite being a naive-looking teenager, he is not to be underestimated. Unmatched in battle, Luffy is a pirate himself who resolutely pursues the coveted One Piece treasure and the King of the Pirates title that comes with it. The late King of the Pirates, Gol D. Roger, stirred up the world before his death by disclosing the whereabouts of his hoard of riches and daring everyone to obtain it. Ever since then, countless powerful pirates have sailed dangerous seas for the prized One Piece only to never return. Although Luffy lacks a crew and a proper ship, he is endowed with a superhuman ability and an unbreakable spirit that make him not only a formidable adversary but also an inspiration to many. As he faces numerous challenges with a big smile on his face, Luffy gathers one-of-a-kind companions to join him in his ambitious endeavor, together embracing perils and wonders on their once-in-a-lifetime adventure.