Make Heroine desu ga Kekkon Shimasu: Kono Naka ni Watashi no Otto ga Iru!?

The year is 2013. Japan, which is facing a serious problem of declining birthrates and an aging population, has established a Ministry of Marriage and developed a national marriage app that allows people to find compatible partners based on genetics, personality, etc. Reon, heartbroken after her best friend seduces her boyfriend, decides to sign up for the Ministry of Marriage app, but.. (Source: Natalie, translated)