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The Seihou Project (西方Project) is a series of vertical danmaku shooting games by the former members of the informal circle Amusement Makers in Tokyo Denki University, the Doujin circle "Shunsatsu sare do?".
As a result, she is rather knowledgeable about the outside world and modern living, although her attempts to explain scientific concepts usually just confuse the locals.
At the end of the eight years, Seiga abruptly bid her new family farewell and faked her own death by using Taoist arts to disguise a bamboo shoot as her body.
As stated in ZUN's Undefined Fantastic Object music comments, Kogasa is a cheery happy youkai, but gets easily depressed when things don't go her way (which is very often), typically when she fails to surprise someone despite her best efforts.
Western fans have noticed that her Phantasmagoria of Flower View depiction resembles a pose as though she is an American rapper due to the way she has her hand.
Her ability to read minds causes various youkai and spirits to fear her, but makes her loved by the animals that normally can't be understood. With these animals as pets, she manages the ruins of the Hell of Blazing Fires where her home stands.
Due to living at the Misty Lake, it's mocked that Wakasagihime was present during the events of Embodiment of Scarlet Devil back in 2003 when the scarlet incident occurred, which makes perfect sense.
Yuugi carries a sake dish called the "Hoshiguma Dish". It raises the quality of any sake poured into it. Kasen Ibaraki later uses this to transform some of her own sake for a party at the Hakurei Shrine. The dish itself is considered a masterwork of the oni.
Daina Marisa 3D (ダイナマリサ3D, lit. "DynaMarisa 3D") is a 3D third-person Touhou Project shooter fangame released by Twilight Frontier that parodies Sandlot's Earth Defense Force 2017.