 If you liked
Orange
|
 ...then you might like
Hello World
|
Both Hello World and Orange are in the romance and sci-fi genre. And both revolve around a character where their 10 years in the future self helps their past high-school self in preventing an accident that happens and saving their loved one, changing the future in where they are happy together.
They both also have an anime adaptation as well if you're an anime before book person.
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Recommended by KaryAnimeTime