"Two years have passed since my husband and I started struggling with infertility." After starting infertility treatment at the hospital, she found out that the cause was her husband, and was faced with the hopeless reality that even if she continued treatment, there was almost no chance of her getting pregnant. Tsubasa still wanted to have a child with the man she loved. She desperately continued to search for the possibility of getting pregnant, wanting to see his happy face. As a last resort, she chose to ask her husband's biological brother, who is her blood relative, to inseminate her.