Shinigami no Ballad.
English name: Momo, Girl God of Death
Genres: Drama, Fantasy, Supernatural
Type: TV, Episodes: 6
Aired: Mar 3, 2006 to Apr 7, 2006
Studio: Group TAC, Ginga Ya
Source: Light novel
Rating: PG-13 - Teens 13 or older
Synopsis:
A girl wrapped in white, her name is Momo...in her hand lies a blunt yet shiny scythe. By her side is a winged black cat by the name of Daniel. Carrying the souls of humans, the girl's existence parallels to that of a "Death God" or "Shinigami". At the instant when this white Death God touches the hearts of humans, the world is filled with kindness and grief... 

(Source: ANN)