In Japan, a covert industry has grown up around the "Wakaresaseya" (literally "breaker-upper"), a person hired by one spouse to seduce the other in order to gain the advantage in divorce proceedings. When Sato hires Kaitaro, a wakaresaseya agent, to have an affair with his wife, Rina, he assumes it will be an easy case. But Sato has never truly understood Rina or her desires, and Kaitaro's job is to do exactly that - until he does it too well. A gripping debut set in modern-day Tokyo and inspired by a true crime.