故事讲述在高级宅邸生活的石川一家的儿子规士,在未经允许的外宿后失踪,他被怀疑与一桩杀人事件有关,因此原本幸福的家庭生活发生改变。Kazuto Ishikawa is a first-class architect. He is married to Kiyomi. They have a son, Tadashi, who attends high school and a daughter, Miyabi, who attends middle school. They live together in a refined home, designed by Kazuto. An injury causes Tadashi to quit play soccer. Since that time, he often stays out all night without permission. One evening, Tadashi leaves home and does not return. Kazuto and Kiyomi become worried about their son and consider going to the police. News then reveal the murder of Tadashi's classmate. The police suspect that Tadashi might be involved in the murder.