Acid Rain is a stage in Tekken 5. The stage is located in Seoul, South Korea, evidenced by many signs written in Hangul. Acid rain is falling in the area of the arena, hence the stage name. The fight takes place on a rooftop with barred, illuminated skylights visible on the ground and a metal fence surrounding the arena, while buildings can be seen in the background. A huge animated robot lobster can be seen higher up on the side of one building with a glowing crescent moon visible nearby, while a small statue of a duck can be seen on the right side of the wall. People can also be seen walking on a bridge nearby.
The characters who have interludes in this stage are:
- This is possibly Lei Wulong's stage. The stage's design is reminiscent of his Tekken 2, Tekken 3 and Tekken Tag Tournament stages.
- This stage is the only stage with two songs, which changes depending on the mode; Story Mode fights have the Asura Mix while other modes have the original).
- When one of the fighters hits the duck statue, the duck statue's head will change position.
- This stage is the counterpart to Festival in Dark Resurrection.