Type-Moon

Type-Moon (タイプムーン, Taipu Mūn) is a Japanese game company, best known for their visual novels, co-founded by author Kinoko Nasu and illustrator Takashi Takeuchi. It is also known under the name Notes Co., Ltd. (有限会社ノーツ, Yūgen-kaisha Nōtsu) for its publishing and corporate operations. After creating the immensely popular visual novel Tsukihime as a dojin soft organization, Type-Moon has since incorporated and produced the also popular visual novel Fate/stay night. Both of their works have been adapted into anime and manga series that have amassed a global fan base.

Notable works
And many spinoffs of those series.
 * Tsukihime
 * Fate/stay night
 * Kara no Kyōkai
 * Melty Blood