The Disappearance of Nagato Yuki-chan

Haruhi Suzumiya!! (1x3)

Air date: Apr 18, 2015

The day after the Christmas party, Nagato and Kyon encounter a girl who falls down in front of a park. After helping her to a warm place, they’re told that she was trying to capture Santa in the park, which makes Nagato remember that she’s met her before.