Board Thread:General Discussion/@comment-26662104-20160720205214/@comment-27362850-20161224081108

Au ignoring Yan-chan's history: Yan-chan is a entity made by the demons fury and vengeance sent to kill. But because the demons can not leave the realm (au), Yan-chan gains amnesia from a accident and is adopted to the Aishi family, while copying her mother's personality unconsciously (somehow). 7 years from now leads to the events of Yandere Simulator.