Story Structure — 5 Plot Phases
Letters Against Fate
Naho receives letters from her future self and sees their prediction come true when Kakeru transfers into her class. The warnings convince her to change her behavior around him.
Key Events
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Future Letters Arrive — Sixteen-year-old Naho receives letters written by her future self. Characters: Naho Takamiya
Location: Matsumoto school route
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Kakeru Transfers In — The letters accurately predict Kakeru's arrival from Tokyo. Characters: Naho Takamiya, Kakeru Naruse, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka
Location: High school classroom
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New Friends Gather — Naho and her friends quickly welcome Kakeru into their circle. Characters: Naho Takamiya, Kakeru Naruse, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka
Location: High school
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Warnings About Kakeru — Naho learns that something terrible will happen to Kakeru. Characters: Naho Takamiya, Kakeru Naruse
Location: High school
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Soccer Team Encouragement — Naho encourages Kakeru to join the soccer team against the letters' events. Characters: Naho Takamiya, Kakeru Naruse
Location: School grounds
A Future Memorial
Naho tries to protect Kakeru through everyday choices involving soccer, Rio, and the fireworks. In 2025, the friends discover that Kakeru's death was suicide.
Key Events
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Rio Relationship Ends — Naho objects to Kakeru pursuing Rio, and their relationship ends. Characters: Naho Takamiya, Kakeru Naruse, Rio Ueda
Location: High school
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Fireworks Together — Naho insists that she and Kakeru watch the school fireworks together. Characters: Naho Takamiya, Kakeru Naruse
Location: Fireworks viewing area
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Future Memorial Visit — In 2025, the friends attend a memorial for the deceased Kakeru. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka
Location: Kakeru's former home
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Suicide Revealed — The friends learn that Kakeru died by suicide rather than in an accident. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka
Location: Kakeru's former home
The Parallel Promise
Kakeru reveals the trauma surrounding his mother's suicide. Hiroto receives matching letters and proposes creating a parallel future, bringing the entire friend group into the rescue plan.
Key Events
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Bon Festival Confession — Kakeru tearfully reveals his mother's suicide and their final conflict. Characters: Naho Takamiya, Kakeru Naruse
Location: Shrine
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Hiroto Receives Letters — Hiroto reveals that his future self also sent him letters. Characters: Naho Takamiya, Hiroto Suwa
Location: Naho's house
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Parallel Future Plan — Hiroto explains that they can create a parallel universe where Kakeru survives. Characters: Naho Takamiya, Hiroto Suwa
Location: Naho's house
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Friends Join Mission — The group learns about the letters and agrees to help Kakeru. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka
Location: Naho's house
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Birthday Gifts Prepared — The friends prepare gifts, and Hiroto obtains flowers requested by Kakeru. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka, Kakeru Naruse
Location: High school
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Relay Team Forms — All five friends sign up to support Kakeru in the relay race. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka, Kakeru Naruse
Location: School grounds
Choosing To Live
The friends support Kakeru through the relay race, helping him regain his spirit. Naho's confession exposes the seriousness of his plan, while his mother's recorded message reshapes his understanding of her death.
Key Events
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Kakeru Reveals Trauma — Before the race, Kakeru reveals the truth about his mother to the group. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka, Kakeru Naruse
Location: Relay race venue
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Relay Race Victory — The friends restore Kakeru's spirit, and he wins as the anchor. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka, Kakeru Naruse
Location: Relay race venue
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Confession Before New Year — Naho confesses her feelings, and Kakeru reveals his suicide plan. Characters: Naho Takamiya, Kakeru Naruse
Location: Minamoto
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Mother's Recorded Message — Kakeru watches his mother's message about her suicide and her wish for his happiness. Characters: Kakeru Naruse
Location: Kakeru's home
Two Possible Sunsets
The friends search for Kakeru on New Year's Eve and save him from his suicide attempt. The ending contrasts the 2025 memorial timeline with a parallel 2015 timeline in which Kakeru survives.
Key Events
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New Year's Eve Rescue — The friends find Kakeru near a truck and prevent his suicide attempt. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka, Kakeru Naruse
Location: Streets of Minamoto
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Two Timelines At Sunset — The 2025 friends watch the sunset while the parallel 2015 group includes Kakeru. Characters: Naho Takamiya, Hiroto Suwa, Takako Chino, Saku Hagita, Azusa Murasaka, Kakeru Naruse
Location: Hill near the town