A serial killer is on the loose in Los Angeles and the local authorities need help fast. Onto the scene comes L, the mysterious super-sleuth and an FBI agent named Naomi Misora.  They conclude that the killing spree is a psychotic riddle designed specifically to engage L in a battle of wits. Stuck in the middle between killer and investigator, it's up to Misora to navigate both the dead bodies and the egos to solve the Los Angeles BB Murder Cases.