In the town of Kurouzu-cho, Kirie Goshima lives a fairly normal life with her family. As she walks to the train station one day to meet her boyfriend, Shuuichi Saito, she sees his father staring at a snail shell in an alley. Thinking nothing of it, she mentions the incident to Shuuichi, who says that his father has been acting weird lately. Shuuichi reveals his rising desire to leave the town with Kirie, saying that the town is infected with spirals. But his father's obsession with the shape soon proves deadly, beginning a chain of horrific and unexplainable events that causes the residents of Kurouzu-cho to spiral into madness.

Although the golden age of piracy is about to reach new heights, most people do not seek the glory of finding the elusive One Piece—a treasure signifying a new conqueror of all seas that was once embodied by the legendary King of the Pirates, Gol D. Roger. However, even if civilians generally despise pirates, they secretly cheer for at least one of them. One red-headed girl from Sabaody Archipelago is no exception: She reveres Nami, the ingenious female navigator of Monkey D. Luffy's Straw Hat crew. Determined to deliver a fan letter to her idol, the Sabaody child is prepared to challenge forces of authority who strive to prevent Luffy and his friends from departing for their next destination: the New World. But to succeed, Nami's fan may need to risk her life and interfere with the Marines' plans, potentially causing devastating consequences for the wider world.

Koyomi Araragi spent his last year of high school helping girls in his town resolve various supernatural afflictions. But now Araragi has departed for university, leaving his friends to fend for themselves against new problems and curses that plague them. Yotsugi Ononoki, once a human corpse and now a living doll, takes residence in Araragi's home, keeping watch over his sister Tsukihi, a girl harboring a mystical secret of her own. As part of her duties, Yotsugi fills Araragi's vacated role as occult expert, assisting others in town with their issues. One of these girls, middle school student Nadeko Sengoku, slowly recovers from her own recent brushes with the paranormal. She avoids returning to school, instead spending time alone in her room and pursuing her dream of becoming a professional manga artist. In order to speed up Nadeko's quest for mastery of her craft, Yotsugi convinces her to create four copies of herself, each representing a distinct aspect of Nadeko's personality. However, the clones refuse to help Nadeko, instead escaping into the town and creating a chaotic mess. Now forced to grapple with her own fractured sense of identity, Nadeko sets out to capture them and resolve her inner conflict.

A spin-off of Blue Lock focusing on Seishirou Nagi.