Keiichi Yoshinaga, who works for a major construction company receives a sudden phone call from his ex-wife, Junko Aoba. She tells Keiichi that their second son, Tsubasa, who lives apart, has been arrested for murdering his classmate. Keiichi immediately meets Tsubasa, but for some reason he keeps silence. Since Tsubasa shows no signs of reflecting upon his conduct, he is possibly going to an open trial. To overcome this situation, Keiichi consults a lawyer Kyoko Kanzaki who has a child of the same age.
Detective Nobuhiko Kamamoto is a detective with the Tokyo Metropolitan Police Department, armed with keen interviewing skills and the ability to read peoples’ personalities. But his personal life is in shambles and he must find a way to juggle problems at home while also handling multiple complicated investigations.