Sora no Aosa wo Shiru Hito yo

A high school student named Aoi Aioi aspires to be a musician and lives in a mountain town with her older sister Akane. Their parents died in an accident 13 years ago, after which Akane abandoned her dream of moving to Tokyo with her then-boyfriend, Shinnosuke Kanomura, to care for Aoi. Aoi feels a deep sense of obligation to her sister. Aoi is invited to perform at a music festival as a session musician by the enka singer Dankichi. Around the same time, Shinnosuke returns to the town. Unexpectedly, a version of Shinnosuke from 13 years earlier, known as Shinno, also appears. Aoi experiences her first love as a result of these events.