If I stay...(Trigger Warning)

Sachi, a self harmer that thinks no one cares about her, has to deal with the hard ships of life.She has no one in school... Has an abusive father... She has no one.
Until one day... A new boy comes to school, Koshiro... She has some one
until the day her father rapes her.
She wants to kill herself... Koshiro can't stop her... Until he stops her father...