Acid Co., Ltd. is a Japanese publisher of adult video games and visual novels that operates under the name age. The company was previously known as Relic and focused on developing video games for consoles. Age was founded by Hirohiko Yoshida, Baka Prince Persia, Nanpuureima, Spin Drill, and Carnelian. Age's games are published under various brands such as age, Mirage, and Φâge.