AIBOU: Tokyo Detective Duo (2002)

S5E10 Castle of Fear

Title: Fortress of Terror Plot: Haunted by a series of unsettling, menacing phone calls, a man becomes convinced that his harasser has invaded his home. In a moment of panic, he fires a weapon, only to discover that he has tragically shot an innocent police officer who was simply trying to help. The man is left to grapple with the dire consequences of his actions and the chilling realization of his mistake.