Shikatanaku Kekkon Shitahazu na no ni Anata o Aishite Shimatta no de Rikon Shiyou to Omoimasu

https://www.cmoa.jp/title/321468/ After losing her only family, her father, her factory is bankrupt. She is betrayed by her stepmother, stepsister, and her lover. At the lowest point of her life, she is suddenly proposed to by the president of a rival company, Reiji Kirigaya. "I want to keep you locked inside me." It was supposed to be a contract marriage to pay off her debts, but Reiji loves her deeply and sweetly. Her heart begins to waver.