Nitroplus Co., Ltd., stylized as nitro+, is a Japanese visual novel video game developer that has developed a number of visual novels, including eroge.
They also have been collaborating with developer Type-Moon to create the light novel series Fate/Zero. Their works usually have dark themes such as reanimation of the dead, rape and murder. They also have a branch of the company called Nitro+chiral, which focuses on Boys’ Love visual novels. Writers aligned with the company, such as Gen Urobuchi, have also contributed to various manga, anime, novel, and television works.
Super Sonico is the mascot of Nitroplus’ annual music festival event, “Nitro Super Sonico”, since 2006. Nitroplus has held their music festival every year since 2000.