Minpou Kaisei: Nippon wa Ipputasaisei ni Natta

Japan introduces a polygamous marriage system aimed at boosting its declining economy and birth rate. To be eligible, individuals must have a significantly higher income than the average or have achieved national recognition in sports, arts, science, or through notable acts of heroism. Asao Shouhei lacks wealth or notable achievements in these areas, but after a single defining event, he earns national recognition as a hero. The story follows him and the three women who love him and become his wives.