More than 30,000 Japanese committed suicide each year. One of the common ways of suicidal is by jumping in front of moving vehicles. As such, it is very common to see many suicidal cases happened in train stations in Japan.
Tanaka Kenji is one of the nine percent of Japanese who suffered from mental illness. Kenji always feel lonely because he neglected his social life for his career and unfortunately, his hard work did not pay off since he is often being rebuked by his employer. This drives him to isolate himself due his insecurities, which leads to social isolation and depression. The situation worsened when he attempted to commit suicide at Chuo Line, Shinjuku Station which is one of the most popular locations for train suicidal in Japan.