Orange follows Naho Takamiya as her sophomore year of high school begins with an uneasy morning and a strange letter addressed to her. Signed by Naho herself and sent 10 years into the future, the letter warns her about the regrets she has yet to understand and urges her to keep a close eye on Kakeru Naruse, the new transfer student who is absent from her future. What starts as an ordinary school day quickly becomes the beginning of something fragile and deeply personal, as Naho tries to decide whether she can trust a message from herself and use it to change what is coming. Guided by those words, she is given a rare chance to protect Kakeru, confront the consequences of small choices, and challenge the path her life will take. Orange blends everyday high school life with emotional tension, following Naho as she struggles to understand how much can truly be altered and how much courage it will take to act before it is too late.