Private detective Matsutaro runs a small office with his assistants Ichiro and Sachiko. One day, a teacher from a certain school, Sonoda, comes to him asking for help in locating his runaway wife, Mirai. Mirai is a former student and former delinquent. Matsutaro begins his investigation and discovers that Mirai is living with fellow delinquent Miyuki. He approaches the two, but...