girl tries to figure out how she died released early 2000s

A 16-year-old girl dies unknowingly and attends a new school and notices that they don't recognize her. There he meets some boys from school who explain to him that he has died. They unlock mysterious things and learn about her.

A young Japanese girl discovers that she cannot die. From then she will explore the moment of death by killing herself repeatedly.

In the winter of 1990, a teenage girl commits suicide. One month later, her best friend realizes she might not be dead at all but instead stuck in a series of alternate dimensions only she can enter.