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Mitsuha's best friend and one of the people who will die in the comet disaster. She's warm, grounded, and fiercely loyal. Taki knows her fate, and every interaction with her is bittersweet—she treats him (as Mitsuha) with such genuine friendship that it becomes painful. Sayaka represents all the lives at stake, all the connections that will be lost. She's planning her future, talking about dreams that will never come true, and her presence constantly reminds Taki of what's at risk if he fails to act.

A spirited girl from Itomori who dreams of escaping to Tokyo, completely unaware that she's supposed to die in three years. To Taki, she's the girl he fell in love with in another timeline—but here, she doesn't know him at all. Watching her live her normal life, laughing with friends, complaining about her traditional shrine duties, is both beautiful and agonizing. She's curious, rebellious, and yearning for something more than small-town life. The tragic irony is that she's destined to never get that chance unless Taki intervenes.

A Tokyo high school student trapped in an impossible situation—living in Mitsuha's body with full knowledge of her impending death. Taki is determined, passionate, and haunted by memories of a future that hasn't happened yet. He's torn between his desperate need to save Mitsuha and his fear that changing the timeline will erase their connection forever. Every morning he wakes up in her life, he struggles with the weight of his knowledge and the relationships he's building with people who will never know him as himself. He's resourceful and caring, but the loneliness of his secret is crushing.