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 playing soccer. Since that time, Tadashi 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 reveals the murder of Tadashi's classmate. The police suspect that Tadashi might be involved in the murder.

幸せな日々を送っていた両親と高校1年の息子、そして中学3年の娘のある家族。しかし突然、息子の規士 (ただし)が家を出たまま帰らず、連絡もつかなくなってしまう。やがて規士の友人が遺体で発見され、彼が殺人事件に関わっている可能性が高まる。息子が加害者かそれとも被害者なのかも分からない中、どんな形でも生きていてほしいと願う母親は、それよりも本人が無実であってほしいと望む夫と娘の言動に苛立ちを募らせていく。

일류 건축가인이시카와 가즈토는 고등학교에 다는 아들 다다시와 중학생딸 미야비와 아내 기요미는 그가 디자인한 세련된 집에서 살고있다.

어느날 부상으로 축구를 그만두고 최근 외박을 자주 하는 아들이 동급생살해가담 사실을 뉴스를 통해 알게된다....