Okatani Wataru, who was an ace reporter in the social affairs department of a major newspaper company, witnesses his wife having an affair and decides to get a divorce. Although he makes steady preparations to gain custody of his daughter, a talented lawyer he consults with tells him that his chance of winning is only 10%. Instead of going ahead with the divorce right away, he works hard with his partner, a detective, to gather evidence of his wife’s affair in order to earn the right to be the rightful caretaker of his daughter. Adapted from the manga series "Rikon Shinai Otoko" (離婚しない男) by Ohtake Reiji (大竹玲二).