Nitroplus

Nitroplus is a Japanese visual novel company that has developed a numerous amount of visual novels and eroges. Examples of their works include Phantom Inferno, Saya No Uta, Demonbane, Steins; Gate, and Fate/Zero. Super Sonico is the mascot of Nitroplus.

Nitroplus also has a branch of their company called Nitro+Chiral, which mainly focuses on developing BL games.