Detective Conan (名探偵コナン) Movie 4 - Captured In Her Eyes (瞳の中の暗殺者)

A series of murders have occured with police officers as victims. One of the officers is shot right in front of Ran's eyes, and the shock of the incident causes Ran to lose her memory of everyone and everything around her. Now Conan must help Ran regain her lost memories, while also protecting her from the muderer, who is targeting Ran for witnessing the crime. Source: ANN