Touhou Project dj - Touhou Christmas Eve. Comic
Touhou dj - Touhou Christmas Eve / Touhou - Touhou Christmas Eve (Doujinshi) / 東方クリスマスいヴ。
Completed Released: 2009

Marisa comes for a Christmas Eve sleepover (with an uninvited stowaway along) and introduces Reimu to the concept, who is pretty quick to get in to the real meaning of the holiday.