Sweet Rain: Accuracy of Death (2008)

They both show stories of people right before their death and they're both AMAZING!!!

Tatsuya was killed in a car accident and his spirit lives in Hikata - the one who killed him in the accident. Since then, he had a hard time trying to change his girlfriend's perception of "him" or "Hikata" while still trying to protect her.

Black is about a detective possessed by the Grim Reaper. Ha Ram can see shadows of death. These two struggle to save the lives of people, breaking the rules of heaven.

Maybe the tone (hana no kusari is darker) and the genre are different, but the main point/ main twist is quite similar ....
You will understand it if you watch
XD

Although their genres are different, the atmosphere is similiar in both movies. Each movie has unearthly elements: in Postman to Heaven the protagonist is an angel, in Sweet Rain the main character is a grim reaper.

Grim Reaper story. Kaneshiro Takeshi & Konishi Manami stars in this movie. A light time travel story with Grim Reaper who can go from doors to doors.

Shin Ji Hyun was enjoying absolute bliss as she was about to marry her fiancé, Kang Min Ho, but her perfect life is shattered when she gets into a car accident that leaves her in a coma. She is given a second chance at life by a person called The Scheduler, but it comes with a condition: she has to find three people outside of her family who would cry genuine tears for her. In order to do this, she borrows the body of Yi Kyung, a part-time employee at a convenience store for 49 days.

About ending of a persons life, and a shinigami who is watching and interacting with the person(s) before he\she dies.

A bit similar story of Grim Reaper. This drama is short & not confusing plot. If you like Koseki Yuta or Kai Shouma this drama is worth watching. This drama based on a comic book.

Both tackle the the role death plays in the lives of the living and how knowledge of death can impact the way one lives.