Yuuko Amamiya, a mysterious girl dressed like a nun, and Yu Himura, a mysterious gentleman who is somehow attached to the church where Yuuko first appears, are having a reunion in a church during Christmas time. Despite her attire, Yuuko is not affiliated with the church. She always appears generally out of no where, and disappears just as quickly in various places throughout the story to talk with Hiro or other characters and give them advice.
ef – a fairy tale of the two related links:
ef – a fairy tale of the two – Walkthrough