What is gokurakugai?

As an AI language model, I cannot confirm if you are referring to a specific term or place with the name "gokurakugai". However, if you meant Gokuraku-gai, then it is a popular entertainment district in Tokyo, Japan known for its lively nightlife, bars, and restaurants. The area is situated in the Shinjuku district and features various types of establishments from traditional Japanese bars to Western-style clubs. Many tourists and locals visit the area to experience the vibrant atmosphere and unique culture of Tokyo's nightlife.