In a house in one of Tokyo's upscale neighborhoods, Yoshitaka Mashiba coldly tells his wife, Ayane, that he's leaving her because she hasn't borne him a child. He's met a young woman and wants to spend the rest of his life with her. The day after that, he's found dead, lying in the living room with a cup of coffee next to him, a few hours before his date with his girlfriend, who turns out to be none other than Hiromi, Ayane's favorite student. It's a tale of two couples, two women, betrayal, humiliated dignity, and a coffee session... taking us into the intimate heart of Japanese life and introducing us to the customs and traditions of that enchanting society, where tranquility and discipline are at the heart of daily life. Throughout this bewildering mystery, where we oscillate between accusing the humiliated widow and acquitting her, seduction and deduction engage in a thrilling struggle, and events play tricks on us until we discover, to our amazement, that revenge in Japan is a drink served hot.