ニトロプラス (in English, NitroPlus) is a Japanese creative company best known for producing story-driven visual novels and related media. Founded around 2000, it built a reputation for dark, intense, and often philosophical narratives, blending science fiction, horror, action, and psychological drama. NitroPlus is especially recognized for its strong writing, striking character designs, and collaborations with notable creators and studios.

Beyond visual novels, NitroPlus is involved in a wide range of projects, including anime, novels, music, and game planning for major franchises. The company also operates Nitro+CHiRAL, a sub-brand focused on boys’ love (BL) titles. Overall, NitroPlus is known for shaping influential, edgy works that have left a lasting mark on modern Japanese pop and game culture.