Nothing is known about Seele's birthplace or who her parents were. In early life, she lost both her parents and was then raised in Cocolia Orphanage alongside some other orphans, including Bronya and Sin Mal. Seele had the least potential to be chosen for Cocolia's experiement, however she managed to awaken her power at the last minute and replaced Sin to take part in the X-10 experiment. She did this in order to save and protect Bronya, only to lead to Bronya chasing after Seele by also participating in the experiment afterwards in hope of finding Seele. The experiment led to a failure that made Seele disappear. After that, Seele was considered dead.