Shinigami no Ballad.

Synopsis

Sakura Kosakai wakes up dazed on the street wondering where she is and realizes that she has to go to school. At school she discovers that people are ignoring her, and she cannot even press the buttons on the vending machine for lunch. She finally remembers that she jumped off a bridge after seeing the boy she liked kiss another girl, and when Sakura goes to the bridge, she meets Momo and Daniel. Sakura takes them around town to check up on those she knew, though they seem fine even though it has only been three days since the accident. Momo takes her out again to check up one the same people as before, and she sees that she is still remembered by her loved ones and friends despite what it initially seemed like. After this, Momo reveals to Sakura that she did not die, but instead her spirit left her body after the accident. After returning to her body, Sakura goes on with her life.

(Source: Wikipedia)