Colorful

Upon reaching the train station to death, a dejected soul is informed that he is "lucky" and will have another chance at life though he does not want it. He is placed in the body of a 14-year-old boy named Makoto Kobayashi, who has just committed suicide by an overdose of pills. Watched over by a neutral spirit named Purapura in the form of a little boy, the soul must figure out what his greatest sin and mistake in his former life was before his six-month time limit in Makoto's body runs out. He also has a number of other lesser duties he must complete, such as understanding what led Makoto to commit suicide in the first place and learning how to enjoy his second chance at life. Read more on Wikipedia.