Life - Mika Nakashima (English sub)

This is the original soundtrack of Life (2007), a Japanese TV drama.
Synopsis: Ayumu passes an entrance exam of an elite high school with the help of Yuko, her best friend, but Yuko fails and blames Ayumu for her failure. Broken hearted from the broken friendship, Ayumu shuts down and gives up on making new friends in high school. But Manami, the most popular girl in her class, is more than happy to accept her as her friend, so she starts to enjoy her new life. But when Manami misunderstands that Ayumu is trying to steal her boyfriend, her insidious bullying of Ayumu begins. With nobody to turn to, as her mother is more concerned about her weak brother, and her teacher is preoccupied with her own problems, she is pushed to the limit of losing herself.