Ever since he was a child, zombie-obsessed Chihiro Furuya has wanted an undead girlfriend. Soon enough, his love for all things zombie comes in handy when his cat Baabu gets run over, prompting Chihiro to try to make a resurrection potion and bring him back to life. During his endeavor, he sees a rich girl named Rea Sanka yelling into an old well every day about her oppressive life. After meeting and bonding with her, Chihiro is convinced by Rea to persevere in saving Baabu. Eventually, he succeeds with the help of the poisonous hydrangea flowers from Rea's family garden. Unaware of the potion's success and seeking to escape the burdens of her life, Rea drinks the resurrection potion, mistakenly thinking she will die. Though it doesn't kill her, the effects still linger and her death from a fatal accident causes her to be reborn as a zombie. With help from Chihiro, Rea strives to adjust to her new—albeit undead—life. For a boy wanting a zombie girlfriend, this situation would seem like a dream come true. But in Sankarea, Chihiro's life becomes stranger than usual as he deals with Rea's odd new cravings and the unforeseen consequences of her transformation.

Years ago, a tragic incident befell a young princess when both her parents died. Devastated, it seemed nothing would calm this poor soul. However, a prince traveling through the area came to see the princess, hoping to cheer her up. After wiping her sorrowful tears, the prince gave her a ring carrying a rose emblem and told her as long as she holds onto the ring, they are destined to meet again. The event leaves a deep impression on the girl, Utena Tenjou, leading her to become a prince herself. Years later, Utena attends Ootori Academy, recognized by the same rose emblem as her precious ring's. There, attracted by the scent of roses, she witnesses Anthy Himemiya tending the flowers, accompanied by the Student Council President Touga Kiryuu and Vice President Kyouichi Saionji, who seem to be arguing over Anthy. While Utena thinks nothing of the occurrence, the Student Council gathers to discuss an important matter. Subsequently, a misunderstanding leads to Utena being dragged into the world of Duelists—those with rings similar to her own. The Duelists fight for the ownership of the Rose Bride, Anthy Himemiya, who is said to possess great power. Wanting to prove her capabilities as a prince, and enraged that Anthy is being wronged and objectified, Utena resolves to fight against the Duelists to save her from the cruel fate.

In the year 0068 of the Universal Century, Casval Rem Deikun's life is thrown into chaotic disarray after the assassination of his father, a prolific figure in the crusade towards civil rights for people who live away from the Earth's surface. Casval and his sister Artesia receive aid from soldiers who were loyal to their father, and the siblings are whisked away from their home, separated, and thrown into a twisted fate that sees them come into their own as soldiers and adults. Years before stealing the name Char Aznable or his Red Comet moniker, Casval must contend with the rise of a militarized version of his father's ideology and his own vengeful nature as intergalactic war molds him into a legendary mobile suit pilot.

The first episode of season one was pre-aired on the Fate Project New Year's Eve TV Special 2020 program.