It seems you're referring to , which may be a mod, fan-made simulation game, or doujinshi (self-published derivative work) centered around "waifu" culture, where players collect or interact with anime-style characters in a city-building or life-simulation context. The title suggests a Christmas-themed update or version of the game, potentially part of a series ("Build 46"). However, there is no widely known academic paper or official reference to this specific title as of July 2024.