Soul Eater NOT! is a spin-off and side story that takes place one year prior to the events of the original Soul Eater. At the Death Weapon Meister Academy, humans born with the power to transform into weapons and those with the power to wield these weapons (Meisters) train to hone their natural talent. The characters of the main series are enrolled in the Especially Advantaged Talent class, where they train to become warriors of justice capable of defeating what threats prey on innocent lives—or even the entire world. Other students at the DWMA are less talented. Members of the Normally Overcome Target class focus less on being warriors of justice and more on controlling their powers so they don't hurt themselves or anyone around them. Tsugumi Harudori, a new halberd-transforming student, meets Meisters Meme Tatane and Anya Hepburn and quickly grows indecisive about which of the two new friends should be her partner. As they learn to use these powers and settle in, their lives as everyday students will be far from normal.

In the midst of the Fifth Holy Grail War, Caster sets her plans into motion, beginning with the capture of Shirou's Servant Saber. With the witch growing ever more powerful, Rin and Archer determine she is a threat that must be dealt with at once. But as the balance of power in the war begins to shift, the Master and Servant find themselves walking separate ways. Meanwhile, despite losing his Servant and stumbling from injuries, Shirou ignores Rin's warning to abandon the battle royale, forcing his way into the fight against Caster. Determined to show his resolve in his will to fight, Shirou's potential to become a protector of the people is put to the test. Amidst the bloodshed and chaos, the motivations of each Master and Servant are slowly revealed as they sacrifice everything in order to arise as the victor and claim the Holy Grail. [Written by MAL Rewrite]

The Holy Grail War is a battle royale among seven magi who serve as Masters. Masters, through the use of the command seals they are given when they enter the war, command Heroic Spirits known as Servants to fight for them in battle. In the Fifth Holy Grail War, Rin Toosaka is among the magi entering the competition. With her Servant, Archer, she hopes to obtain the ultimate prize—the Holy Grail, a magical artifact capable of granting its wielder any wish. One of Rin's classmates, Emiya Shirou, accidentally enters the competition and ends up commanding a Servant of his own known as Saber. As they find themselves facing mutual enemies, Rin and Shirou decide to form a temporary alliance as they challenge their opponents in the Holy Grail War. [Written by MAL Rewrite]

In the small, impoverished Tison Village of the Parthevia Empire, a boy, Sinbad, is born to the jaded ex-soldier Badr and his kind-hearted wife Esra. His birth creates a radiant surge throughout the rukh, a declaration of a singularity to those who stand at the pinnacle of magical might: the "Child of Destiny" is here. Despite his country being plagued by economic instability and the repercussions of war, Sinbad leads a cheerful life—until a stranger's arrival shatters his peaceful world, and tragedy soon befalls him. Years later, mysterious edifices called "dungeons" have been erected all over the world. Rumored to contain great power and treasures, these dungeons piqued the interest of adventurers and armies alike; though to this day, none have returned therefrom. Sinbad, now 14, has grown into a charming and talented young boy. Inspired by the shocking events of his childhood and by his father's words, he yearns to begin exploring the world beyond his village. As though orchestrated by fate, Sinbad meets an enigmatic traveler named Yunan. Stirred by Sinbad's story and ambitions, Yunan directs him to a dungeon which he claims holds the power Sinbad needs to achieve his goals—the "power of a king." Magi: Sinbad no Bouken tells the epic saga of Sinbad's early life as he travels the world, honing his skill and influence, while gathering allies and power to become the High King of the Seven Seas. [Written by MAL Rewrite]