Nageku Shinigami (嘆く死神) is a one-shot manga written and illustrated by Miyuki Mitsubachi. It was serialized in Hana to Yume.
Rondo is a shinigami. And as we all know, Shinigami are gods of death so they take away dying souls. But Rondo takes away souls by delivering a kiss to them. Then he meets Horiuchi Honoka. She's bright, cheerful, but dying. He gets to know her and taking away her soul seems harder and harder to do. But she must die! What can he do to save her.....?