From Tekkenpedia

Secret Garden
Walls	Yes
BG Music	Massive Stunner

Secret Garden is a stage in Tekken 5. It is a place filled with many flowers and plants. Concrete walls, a fence, and gates surround the fighters. A tall building can be seen in the background. The sky is very cloudy.

Note: There is a frog lounging around in the garden, and if you or your opponent fall on it, you will see its ghost rise up to heaven. Happens aleatorily, because the frog is difficult to see when you're in the middle of a battle.