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One day, Naho Takamiya receives a letter written to herself from ten years in the future. As Naho reads on, the letter recites the exact events of the day, including the transfer of a new student into her class named Kakeru Naruse. The Naho from ten years later repeatedly states that she has many regrets, and she wants to fix these by making sure the Naho from the past can make the right decisions—especially regarding Kakeru. What's more shocking is that she discovers that ten years later, Kakeru will no longer be with them. Future Naho asks her to watch over him closely.
- Animation
- Drama
- Sci-Fi & Fantasy
Viewing market
Country-level availability
Where to watch in United States
1 platform currently listed across all viewing options
Data checked 20 Oct 2026, 06:35 UTC
Included with subscription
1Streaming providerRakuten VikiNo linked platform guide yetDetails unavailable
Free with ads
1Streaming providerRakuten VikiNo linked platform guide yetDetails unavailable
Series schedule
Seasons and episode dates
A concise series timeline, including the latest aired episode and the next date currently listed.
- First aired
- Seasons
- 1
- Episodes
- 13
- Status
- Ended

Latest aired episode
LETTER 13
Naho can't give her Valentine's Day chocolate to Kakeru. Ever since what happened on New Year's Eve, Kakeru keeps putting distance between Naho and himself. But, through all the hardships, Naho refuses to give up and fully intends to tell Kakeru how she feels. And so, the time comes for everyone to face the fateful day outlined in the letters from the past, "Kakeru's Final Day."
Next listed episode
No upcoming episode date is currently listed.
Season guide
Most recent seasons first
Season 1
13 episodes
First episode aired
About these dates: Air dates describe the series schedule and may change. They do not confirm that an episode is available on the same date from the providers listed above.
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