A Sapporo-based musical ensemble doujin group best known for remixes of music from the Touhou series.
Their song "魔理沙は大変なものを盗んでいきました", known in English-language fan circles and beyond as "Marisa Stole the Precious Thing" or "Marisa Stole Something Very Important", has, through its popular and memetic promotional video (post #82943), brought Touhou and the Alice Margatroid/Kirisame Marisa pairing to the attention of a huge number of people.
