「こんな大惨事になるなんて」横須賀線を狙った理由は“婚約者にフラレた”から⋯未熟すぎる爆破犯の「意外な正体」（昭和43年の事件）（文春オンライン） - Yahoo!ニュース

This page covers the 1968 Yokosuka Line bombing incident. The perpetrator was Yoshinori Wakamatsu, 25, who planted a time bomb on a train after being rejected by his fiancée. Born in Yamagata Prefecture, Wakamatsu lost his father in World War II and was raised by his mother. He was quiet and studious but couldn't afford high school. At 17, he moved to Tokyo to apprentice as a carpenter, eventually becoming a skilled worker pursuing a second-class architect license. Four months after the bombing, police identified him through candy box evidence and he confessed.