Don't Leave Me All Alone

It was supposed to be another normal school day for the students of West High School. No one saw the end coming until it was too late. A second-year student from class 2-1, a girl name Seiko Morikawa broke up with her boyfriend, after seeing him kiss another girl. Heartbroken she thinks nothing can any worse, she was so wrong. Seiko and her classmates were in the gymnasium playing basketball, when they heard the intercoms going off and screams fill their ears. The gymnasium is not connected to the school, so everyone is waiting for help. However Seiko is very worried for her best friend, Ryuu Wakisaka whose in another class.
While this is happening Seiko tries to call her cousin Takashi Komuro from Fujimi High School, But because their school's are too far away the phones won't work. She is so scared for her best friend and cousin, will she ever see them again or be left all alone?