Orange

Regret is a universal human experience, but few are ever granted the chance to rewrite their past. Sixteen-year-old Takamiya Naho’s life is suddenly upended when she receives a mysterious letter allegedly written by her twenty-seven-year-old self. The message warns her that a new transfer student named Naruse Kakeru will be joining her class and urges her to watch over him carefully. Faced with this cryptic warning, Naho must navigate the delicate balance between trusting the impossible letter and understanding its profound implications for both her own future and Kakeru’s fate. The main narrative spans five volumes and is accompanied by "Haru-iro Astronaut" (Spring-Colored Astronaut), a story about identical twins Mami and Tomoki. Despite sharing everything, the two possess vastly different personalities: Mami is gentle and unable to refuse others, while Tomoki possesses a strong sense of duty and a deep spirit of sacrifice for his sister's happiness. However, they soon discover that some things cannot be shared—especially something as extraordinary and unique as an alien. Additional side stories include "Mirai" and "Suwa Hiroto," the latter focusing on Naho and Suwa's lives in a timeline where Kakeru passed away at seventeen. The series was nominated for the 20th Annual Tezuka Osamu Cultural Prize.