is a Japanese manga series written and illustrated by Yoshitoki Ōima. It has been serialized in Weekly Shōnen Magazine since November 2016, with individual chapters collected by Kodansha into twenty tankōbon volumes as of August 2023. The story is about an immortal being, Fushi, who takes on multiple forms and freely utilizes their respective natural abilities at will, including that of an abandoned white-haired boy and his white wolf, in order to further evolve and stimulate as it learns what it is to be truly human over the decades and centuries.

Ōima, inspired by her own grandmother's death, aimed to write about survival and the character Fushi, who initially is an emotionless stone but gradually develops a self and personality as a result of interacting with humans, young and old alike. In contrast to her previous work, A Silent Voice, To Your Eternity puts little focus on the cast's past but instead, upon the future.

To Your Eternity

To Your Eternity has been well received in Japan, earning many awards and major sales. Critical response to the series debut was positive, based on the emotional focus on the villagers and Fushi to the point of often earning perfect scores. Despite some skeptical commentary on subsequent chapters lacking the same impact, Fushi's continuous character arc was praised while Ōima's artistry enjoyed positive reviews due to its detailed facial expressions and environments. In North America, the manga is licensed by Kodansha USA for a digital and printed English release. An anime television series adaptation of the manga, produced by Brain's Base, aired from April to August 2021 on Japan's NHK Educational TV; a second season produced by Drive aired from October 2022 to March 2023. A third season has been announced.

To Your Eternity

Plot

Part one

An otherworldly being called the Beholder creates a white orb (later named Fushi by a rambunctious young girl). Fushi takes on the form of a rock, then a dying arctic wolf. Fushi meets a white-haired boy living alone who mistakes him for his pet wolf, Joaan. After the boy dies, Fushi takes his form. He travels to the land of Ninannah, and meets a young girl called March, who was chosen as a sacrifice to a large white bear named Oniguma. March names Fushi and teaches him the rudiments of speech, and how to use his hands. Fushi defeats Oniguma, and he, March, Parona (an older sister figure to March), and the elderly woman Pioran, are taken prisoner by Hayase, to Yanome. They escape, but young March is killed protecting Parona and becomes a spirit. Fushi part ways with Parona and leaves Ninannah to escape Hayase, who is determined to control Fushi.

To Your Eternity

Accompanying Pioran, Fushi begins to speak like a child. As they travel to Takunaha, they are attacked by a plant-like being that can steal Fushi's forms and memories, a Nokker. Fushi kills it, regaining his memories. In Takunaha, Fushi meets a boy named Gugu, who was disfigured in an accident after saving Rean. Gugu saves Fushi from another Nokker, and Fushi, Gugu and Rean become friends. For four years, Fushi refrains from transforming or creating objects in order to live as a human. A Nokker attacks and Gugu was killed in the process while sacrificing himself to save Rean, who becomes a spirit like March. Fushi leaves Takunaha, paranoid of Nokker attacks, followed by Pioran.

Hayase pays a girl named Tonari to lure Fushi and Pioran onto a prison ship to Jananda island. Fushi enters the island's gladiatorial tournament. In the final round, Fushi faces Hayase, who reveals she killed Parona, assuming her form. An enraged Fushi is defeated by Hayase, who captures and attempts to rape him. Tonari and her friends come to try and save him, but at the same time, Nokkers attack the island, and three of Tonari's friends are killed. Fushi kills the Nokkers, and leaves the island with Hayase, abandoning her to die in the ocean, where she is attacked by a Nokker. Fushi reunites with Pioran and travels to an uninhabited island, but she develops dementia. Before her death, she asks the Beholder to have herself reborn as something useful to Fushi, a horse that Fushi later acquires.