Yawahada tenshi: Kon'ya mo daite (2001)

When Takeshi visited his girlfriend Keiko's apartment, he found her in the middle of having sex with another man, Kojima. In reality, Keiko had deliberately invited Kojima over because she wanted to break up with Takeshi; she then unilaterally ended their relationship. Heartbroken and wandering the city streets while drowning his sorrows in alcohol, Takeshi paid for the services of "Angel Aya," a prostitute who operated out of the area beneath the railway overpass...