The sequel to the masterpiece mystery "What Did You Do That Day?"

On Christmas Eve, a woman's body is discovered on the first floor of a vacant building in Shinjuku Ward. The woman, believed to be in her fifties, has disheveled clothing, and her identity is unknown. Shuhei Mitsuya from the First Investigation Division of the Metropolitan Police Department and Gakuto Tadokoro from the Totsuka Police Station team up once again to handle the investigation.

Soon, the woman's fingerprints are found to match those collected from the scene of an unsolved stabbing of a man in Chiba Prefecture. Her identity is revealed to be Ikuko Matsunami, and it is discovered that she was homeless.
What is the truth behind these two mysterious incidents connected by an unexpected link—!?

Why did she have to be killed?
Why did she become homeless?
The moment the truth that no one knew is revealed, the world turns upside down.

Depicting unreasonable death and the collapse of a family with overwhelming brushstrokes, this is the sequel to the smash-hit mystery "What Did You Do That Day?"!!!