Kanon

Yuichi hasn't seen his cousin Nayuki in years. Now that he's back, he can't remember ever visiting before. He struggles to settle into the strangely familiar town, but the holes in his memory linger as time begins to run out. Clues start to emerge - a quiet red-haired girl, a mysterious figure with a winged backpack, and a demon hunter armed with a sword - but Yuichi must figure out how they're all connected.