Shinichi's life returns to "normal" after A's killing spree, but Shinichi remains in low spirits. His mother, Nobuko, becomes worried, but Shinichi just bluffs when she asks him what's wrong. His father, Kazuyuki, suggests to Nobuko that a past incident may be involved. Nobuko looks down at the old scar on her hand and thinks back to what happened when Shinichi was a little boy...

Incapable of rationala thought, Shimada Hideo is a savage beast on a rampage, and Satomi's class has become his prey. Shinichi must make his way through the carnage in order to save Satomi...