Inspector Shiratori, Memories of the Cherry Blossom (Part 2)

Shiratori has Takagi search for the drinks at the theater and to bring them to the apartment. Shiratori reveals his deductions and explains that Kasakura drugged him with sleeping pills and placed her tuque on him to create her alibi by having Shiratori impersonate her. Takagi arrives at the department and shows them Shiratori's drink.

Synopsis excerpt via Kitsu.