Orange

Orange is a Japanese science fiction manga written and illustrated by Ichigo Takano, aimed at both shōjo and seinen demographics. The series follows high schoolgirl Naho Takamiya, who receives a letter written by herself ten years in the future. She is tasked with keeping an eye on Kakeru Naruse, a transfer student whose mother committed suicide on his first day of school. It was first serialized in 2012 in Bessatsu Margaret manga magazine and later in Monthly Action.

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