Densha Otoko
There are four manga adaptations of the "Densha Otoko" novel. All four adaptations are based on the purportedly true story of a 23-year-old otaku who intervened when a drunk man was harassing several women on a train. The otaku ultimately begins dating one of the women. The four adaptations in order of publication are: "Train_Man: Densha Otoko" by Hidenori Hara; "Densha Otoko: The Story of a Train Man Who Fell in Love With A Girl" by Wataru Watanabe; "Train_Man: Go, Poison Man!" written by Hitori Nakano and illustrated by Daisuke Dōke and "Train_Man: A Shōjo Manga" by Machiko Ocha.