Tsubaki, a high school senior, was at a point in her life where she needed to think about her future. However, her circumstances were far from ordinary.

4 years prior, her father, Hideaki, had committed a murder, taking the life of an elementary school boy. Since then, Hideaki had disappeared and was presumed dead.

One day, there was a report of a man resembling him approaching a child in the park, where the incident had occurred. The man, after the investigation, turned out not to be Hideaki. Tsubaki confided in the police. "When I heard the report, I found myself hoping that my father was still alive, despite another child nearly being attacked. I fear my heart may be as shattered as my father's."

Two years later, Tsubaki's younger brother went missing. A claim was made on social media, "I have killed the son of the despicable murderer." The claim was a hoax, and her brother was found safe. Yet, another report came in that Hideaki, presumably anxious for his son, had been spotted.

高校３年生の椿は、将来について考えなければいけない時期に来ていた。しかし椿は他の人とは違う環境にいた。椿の父・秀明は４年前に小学生を殺害する事件を起こして消息を絶ち、もう死んだと思われていた。

ある日、似た男が公園で子供に声をかけたと目撃情報が入った。しかし男は別人だった。警察に思いを吐露する椿。「私、目撃情報を聞いて『お父さんが生きていて嬉しい』と思っちゃったの。また小さい子が襲われかけたのに、私の心もお父さんみたいに壊れているのかもしれない」

２年後、椿の弟が行方不明になる事件が起こる。SNSに「卑劣な殺人犯の息子を殺害した」と犯行声明が出される。だが犯行声明はイタズラで、弟は無事だった。しかし今度は、弟を心配して出てきたであろう秀明が目撃されたという情報が入り…。