Even if a parent divorces, he or she is still an irreplaceable parent for the child. The parent-child relationship lasts forever. While some fathers (mothers) do not meet their children when divorced, some fathers (mothers) cannot meet their children even if they want to. However, even after divorce, the role as a parent continues. According to Ministry of Health, Labor and Welfare statistics, approximately 220,000 children experience parental divorce each year. One of the worries when parents get divorced is their children. Psychological studies have shown that parental divorce has many implications for children. One of the pains a child experiences is a fierce battle between father and mother over their child's visitation and custody. On the other hand, if the father and mother can cooperate in raising children for the child after divorce, there will be few problems such as sadness and anxiety of the child, school refusal and withdrawal tendency, and the child will grow up with a high sense of self-affirmation. , I know that I can build good relationships with others. However, in Japan, which has a single custody system after divorce, many people find it very difficult to raise children in cooperation with a former partner. This free app is aimed at divorced people, families thinking about divorce, or professionals supporting families (lawyers, clinical psychologists, social workers, family court investigators, etc.) and divorces for children and parents. It clearly conveys the impact and tips and tricks for fathers and mothers to work together to raise children for their children after divorce.