Movie
Description
Koyomi Takasaki's life starts with his parents' divorce; he chooses to live with his mother. After his grandfather dies, Koyomi experiences his first involuntary parallel shift at age seven, temporarily moving to a world where his grandfather lives, his deceased dog Yuno exists, and he had chosen to live with his father. This early event establishes his foundational understanding of multiverse mechanics.
As a high school student, he faces social isolation in an academically focused environment. Classmate Kazune Takigawa approaches him, claiming to be from the 85th parallel world where they are lovers—a prank motivated by his refusal to speak at a school ceremony. Though Kazune repeatedly rejects his romantic confessions, the interaction initiates their friendship through shared study sessions. These gatherings gradually include other classmates, easing his social integration.
After entering university together, Kazune initiates a romantic relationship. They marry, have a son named Ryō, and both join the Imaginary Science Research Institute, contributing to stability improvements for devices measuring parallel world shifts. During a family outing, an attacker causes chaos at an exhibition. While Koyomi saves Kazune and Ryō, an optional shift occurs, forcibly transitioning him to a specified parallel world. This replaces his Kazune with a version from the 13th parallel world where Ryō died in the attack. He supports this alternate Kazune through her grief until she returns to her original world. Subsequent identity diffusion makes his returned wife "numerically" different from the original, yet their relationship endures into old age.
In his elderly years, an alternate Kazune Takigawa from a world where they never married initiates an optional shift. She requests his wife send him to the Showa-dori intersection to fulfill a promise to Shiori Satō—a woman significant in another timeline. There, he encounters an elderly Shiori as a spectral consciousness ("Imaginality"). Though neither recognizes the other, her confirmation of living happily brings him contentment. Reflecting on his life with gratitude towards his wife, he acknowledges having lived happily despite the complexities of cross-world relationships and losses.
As a high school student, he faces social isolation in an academically focused environment. Classmate Kazune Takigawa approaches him, claiming to be from the 85th parallel world where they are lovers—a prank motivated by his refusal to speak at a school ceremony. Though Kazune repeatedly rejects his romantic confessions, the interaction initiates their friendship through shared study sessions. These gatherings gradually include other classmates, easing his social integration.
After entering university together, Kazune initiates a romantic relationship. They marry, have a son named Ryō, and both join the Imaginary Science Research Institute, contributing to stability improvements for devices measuring parallel world shifts. During a family outing, an attacker causes chaos at an exhibition. While Koyomi saves Kazune and Ryō, an optional shift occurs, forcibly transitioning him to a specified parallel world. This replaces his Kazune with a version from the 13th parallel world where Ryō died in the attack. He supports this alternate Kazune through her grief until she returns to her original world. Subsequent identity diffusion makes his returned wife "numerically" different from the original, yet their relationship endures into old age.
In his elderly years, an alternate Kazune Takigawa from a world where they never married initiates an optional shift. She requests his wife send him to the Showa-dori intersection to fulfill a promise to Shiori Satō—a woman significant in another timeline. There, he encounters an elderly Shiori as a spectral consciousness ("Imaginality"). Though neither recognizes the other, her confirmation of living happily brings him contentment. Reflecting on his life with gratitude towards his wife, he acknowledges having lived happily despite the complexities of cross-world relationships and losses.