Gentlemaniac Co., Ltd (Sometimes spelt as 'Gentle Maniac') is a game development company specializing in subculture games founded by the core developers of Last Origin. The company holds a unique position in the market by pioneering subculture games targeted at adult men.

In addition to core games, the company is also developing web novels, and animations, and blockchain games. The company serves gamers in South Korea. It was founded in 2021 and is based in Seoul, South Korea.