Aoyama Takashi is a salesman who work in a company that exploit him. He is overworked, hit by his superior, and only paid his basic salary with no overwork extra. Aoyama is depressed and thinks about committing suicide. One day, he tries to throw himself in front of an upcoming train. However, he is saved by Yamamoto, a cheerful guy who claims to be Aoyama childhood friend. Aoyama starts to change because of Yamamoto, but when he starts digging into Yamamoto's identity, he realizes that the person named Yamamoto actually committed suicide three years ago. (Source: MyDramaList)