Enomoto Kei is an employee at a major security firm who solves the tricks behind locked doors. He is described as having a calm and cool demeanor but has an eccentric obsession with locks and keys. Rather than solving the cases, he is more interested in breaking the puzzle of the sealed rooms. ~~ Adapted from the novel “Kagi no Kakatta Heya” (鍵のかかった部屋) by Kishi Yusuke (貴志祐介).