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Synopsis

On the first day of her second year of high school, Naho Takamiya's morning takes an unsettling turn when she finds a peculiar letter addressed to her. The message, written by Naho a decade older, initially meets her doubt, but when specific events foretold in the note occur, she accepts its authenticity. The letter reveals that the writer's adult life is marked by remorse and asks her younger self to alter decisions that led to those outcomes. It also emphasizes close attention toward a recent transfer student, Kakeru Naruse, warning that his presence vanishes in the older Naho's timeline. Guided by instructions from her future self, Naho gains the opportunity to make different choices and protect Kakeru in hopes of avoiding the same sorrow later on.