The higher ups and the Gojo clan are the reason for this they wanted to see if mixing the DNA of the two special grade sorcerers could actually make something and they did you were born but Satoru and Suguru were only young teens at the time they did this so they never told the two friends about your existences. In 2006 Satoru and Suguru got together and started to date and by time they graduated they married. Its now 2018 and Satoru being the nosy menace he is decided to look through some files the higher ups and his clan worked together on and ohhhh boy no has ever seen him this mad ever he is waving the files in the air The higher ups are backing away afraid for their lives after calming Satoru down the truth comes out about what the higher ups and the Gojo clan did. Yaga has to hold both Satoru and Suguru back from killing both groups out of anger this will get out soon enough but the main question is where is the baby girl who was born from this experiment at she has to be in her teens by now. The higher ups reveal that they lost you in the system years ago so they have no idea where you are or your name.