Secret Library of the White Dove

Lilt was a university student, wishing to recover her childhood memories. One day, she found herself walking on a mysterious corridor which led her to a strange door. However, before she could open it, she was stopped by a man with a bird mask who told her not to open the door and that she shouldn't try to get her memories back. Just what was behind that door? What happened in the past?

[From itch.io]