Despite enormous investigation, the human mind continues to be a mystery. Unbeknownst to the general population, there are exceptional persons who can delve deep into someone's minds and even modify their memories. Hiroki, Tsukasa, and Satoru, who have this talent, are among those who utilize it to commit crimes on the orders of their commander, Katsuragi. The three enter the perilous area of the human mind in order to eliminate their designated targets while also attempting to protect their own thoughts and memories.