The intercom rings. When Tanaka Yuka responds, she sees a woman she doesn't recognize. The woman says she wants to pay back the money she'd borrowed...

The intercom rings. When Tanaka Yuka responds, she sees a woman she doesn't recognize. The woman says she wants to pay back the money she'd borrowed...

A psychological thriller centered on Sakai Yoichi, a freelance video director, and Mitsumi Kei, a piano teacher who moonlights as a serial killer....