Chisato Takatsukasa, only 35 years old, looks much younger due to his youthful appearance. He idolizes Saki Shunka, an enigmatic and bestselling mystery writer, and is a writer himself. Chisato is incredibly protective of his son, Riju, whom he believes is constantly at risk from his classmates. As a result, Chisato has gone to great lengths to keep Riju apart from his peers. Nonetheless, Chisato can't rid himself of Riju's persistent friend, Shunsuke Sakaki, whom he loathes more than anyone else. As secrets and ulterior motives begin to emerge, it becomes apparent that the situation is more complex than previously thought. What causes Chisato's paranoia, and what connection does Shunsuke have to Saki Shunka?