Your Name.

Mitsuha Miyamizu is a high school student in Itomori, a rural town in Gifu. Bored of her provincial life, she wishes to be reborn as a boy in Tokyo. Soon, she begins to intermittently switch bodies with Taki Tachibana, a high school student and part-time waiter from Tokyo's Shinjuku ward. On certain days, they wake up in each other's bodies and must live the entire day as the other, reverting to their own bodies during sleep. They set rules for sharing their bodies, communicating via writing on paper, their phones, and their skin. In each other's bodies, Mitsuha sets Taki up on a date with his coworker Miki Okudera, while Taki increases Mitsuha's popularity at school, and accompanies her grandmother Hitoha and younger sister Yotsuha to a shrine in the Goshintai crater. He offers kuchikamizake fermented with Mitsuha's saliva. Hitoha explains God's sovereignity over both time and the connections between humans. Mitsuha informs Taki that Comet 279P/Tiamat is expected to pass nearest to Earth on the day of the autumn festival. The next day, Taki goes on a date with Okudera in his own body; Okudera enjoys it, but, through his unusual behavior, infers Taki's preoccupations with someone else. Realizing his feelings for Mitsuha, Taki attempts and fails to call her. The body-switching stops as inexplicably as it started.

Taki, Okudera, and his classmate Tsukasa Fujii travel to Hida to search for Mitsuha. Taki, being unfamiliar with her town's name, sketches it from memory. A Takayama ramen-shop owner, recognizing it as Itomori, offers to take them there. They discover its ruins, almost entirely decimated by Tiamat's fragments (while Mitsuha's messages simultaneously vanish from his phone). The comet having passed in 2013, Taki realizes that he and Mitsuha were separated by three years, because he lived in 2016. At Hida City Library, the three discover that the family Miyamizu and their friends were among its 500 fatalities. Taki begins to lose his memories of Mitsuha. Later, Taki rushes to Goshintai to imbibe Mitsuha's kuchikamizake. Upon doing so, he faints, undergoing a vision chronicling much of her life, and realizes that she once came to Tokyo to find him. Although unaware of her identity, she passed her kumihimo braid onto him, which he has worn as a lucky bracelet ever since. He awakens in Mitsuha's body on the festival morning. Hitoha undergoes an epiphany upon observing "Mitsuha's" uncharacteristic behavior; speaking directly to Taki, she reveals that the body-switching has been in their family for centuries. Realizing he has a chance to save Mitsuha and all Itomori, Taki convinces Mitsuha's friends Sayaka and Tessie to assist in broadcasting an emergency evacuation before Tiamat's impact. He returns to the shrine, where Mitsuha has awakened in his own body. At twilight, their timelines intersect, allowing them to meet in person. Taki returns Mitsuha's braid; as they attempt to write their names on each other's palms, twilight ends before Mitsuha can write hers.

Running back to Itomori, Mitsuha observes the evacuation's failure. She successfully convinces its mayor, her estranged father Toshiki, to order a drill. Beginning to forget Taki, she discovers that he wrote "I love you" on her hand instead of his name. Taki awakens in his own time without memory of Mitsuha.

Five years later, Taki has graduated from university; with persistent melancholy, he struggles in job-searching. He has continuously fixated on Tiamat's impact, whence Itomori's residents were saved through said drill. Eventually, on April 8, 2022, he glimpses Mitsuha, now a Tokyo resident, on a parallel metro train; they race to find each other. On the steps of Suga Shrine, Taki calls out to Mitsuha, and they simultaneously ask for each other's names.