Orange is a poignant age gap romance manga written and illustrated by Ichigo Takano. The story follows Naho Takamiya, a high school girl who receives letters from her future self, warning her about the regrets she will have regarding her classmate, Kakeru Naruse. Determined to change the future, Naho develops feelings for Kakeru, who is younger than her, and tries to prevent his tragic fate. The manga explores themes of friendship, second chances, and the impact of the age gap on their relationship. Orange is praised for its emotional storytelling, relatable characters, and beautiful artwork.