Synopsis

Set in Susukino, Sapporo, this is a new movie in the Tantei wa Bar ni Iru series that follows a detective (Oizumi Yo) and his partner Takada, as they get involved in troublesome cases and try to uncover the truth.
 
Susukino, Sapporo. In this entertainment district operates a jack-of-all-trades detective (Oizumi Yo) and his partner Takada (Matsuda Ryuhei).
One freezing winter night, the black rotary phone rings inside the bar “Keller Oohata,” the detective’s usual haunt.
“I need you to deliver a letter to someone.”
The voice on the line belongs to Junko – the woman the detective once loved with all his heart.
What begins as a mysterious request soon pulls the detective and Takada into a far-reaching conspiracy. Before long, the story accelerates toward a shocking and completely unpredictable turn of events.