该剧改编自和山やま的同名漫画，漫画两部分分别描述了神秘而充满魅力的林美良，和由于初中过于受人欢迎而向往平稳日常的二阶堂明的高中生活。电视剧中，漫画里未相遇的各个角色命运将会交织在一起。

The story of a would-be actor, his larger-than-life classmate and their friends. Unfolding their past and present, Sasaki in My Mind looks head-on at adolescent sparkle and the pathos of bygone days.

Documentary director Yuko portrays a school violence incident from three years ago that resulted in suicides, while she was teaching classes at her father’s cram school. As her documentary project progresses, Yuko discovers a hidden truth and becomes deeply involved in the lives of the families pained by that secret truth.