After waking from a long cryogenic sleep, high school student Akira Himegami finds himself in a world he no longer recognizes. The city lies in ruins from war, society is now governed by an organization called OWEL, and traditional marriage has been replaced by a new system known as Elsie. As Akira struggles to comprehend this drastically changed future, a familiar figure appears before him—Yuugure, who bears a strong resemblance to his girlfriend Towasa. To his shock, Yuugure smiles gently and proposes: Akira... please marry me. Confused by her sudden proposal, Akira agrees to travel with Yuugure, holding onto hope that somewhere in this world, the real Towasa is still alive. Along their journey, they encounter the evolving forms of love in this new era and reflect on what their bond truly means. (Source: MAL News)

Episode 0 of Towa no Yuugure.

In ancient times, some witches married their familiars, who had taken human form, giving birth to a lineage of ogres. One such ogre is Morihito Otogi, who while appearing completely human, still retains the inhuman strength of his bloodline. Nico Wakatsuki is a young witch and Morihito's childhood friend, but as part of her education, she had to go to the Witches' Holy Land to train and part ways with Morihito. Years later, just before Morihito's first year of high school, Nico returns home with one goal in mind: to claim him as her familiar. While most witches choose a cat or a bat, Nico has her heart set on Morihito in more ways than one. Although seemingly oblivious to her true feelings, Morihito and Nico end up living together under the same roof with both of Morihito's parents elsewhere. While reluctant at first, Morihito accepts his new role, determined to help Nico seamlessly fit back in with human society and protect her from fated disaster.

For hearing-impaired university student Yuki Itose, silence has been a natural part of life since birth. Her world is small and isolated; she commutes to campus, interacts with her best friend Rin Fujishiro, and communicates through writing and text messages—a lifestyle that offers little to no change. One day, during her commute, Yuki meets fellow student Itsuomi Nagi, a multilingual travel enthusiast and friend of Rin. When Itsuomi learns of Yuki's condition, he takes it in stride, moving Yuki's heart. From this one simple gesture, Yuki and Itsuomi's lives start changing day by day as they let each other into their own worlds.