Ancient Corp. (株式会社エインシャント, Kabushiki-gaisha Einshanto) is a Japanese video game developer company. It was founded on April 1, 1990, by the video game music composer Yuzo Koshiro and his mother, Tomo Koshiro. The company is best known for their works alongside Sega, having worked on both Streets of Rage 2 and Streets of Rage 3. Ayano Koshiro, Yuzo's sister who also works in the company as an illustrator, have done the main illustrations for both games.