Nine days before the mass stabbing, Nakasako's accomplice, Mazaki, settles into a hotel to begin his plans. However, a theft throws everything awry, leading him and a couple of innocent hotel employees down a deadly path. In the present, Shuji accidentally finds a clue that leads to the identity of the mysterious man.

When Shuji falls victim to a deadly trap, Soma and Yarimizu learn about Shuji's painful past, forcing Soma to confront his own demons. However, the trio's pasts are not the only secrets they uncover when they finally learn why Mazaki willingly put everything on the line to threaten and blackmail Titus Foods.