How to open the door to the VIP room in the "Health Villain room"?
how do I get in the vip bunny room
First get an ending (Not sure if any ending is ok but to be safe get the good end). Continue on after the ending save.
Go to the home general store found in the urban area (bottom left of the map). Buy a pickaxe from there. Warp to the tunnel. Continue into Tunnel BF2. Go further up after the chests. You'll be in a secret room where there is a switch behind a rock. Break the rock and flip the switch. Go back into Tunnel BF1, go over the newly formed bridge at the bottom and into the down exit. Win against the monster and walk back to BF1. Talk to the man. Go to the fork in the road and take the now free upper path. Continue on the path and enter the house. Talk to the person there.
Warp to the Cargos Group Hideout. Go into the double door after the left bridge. Go into the left entrance. Go into the teleport pad (make sure you are ready to fight the 4 Cargos group execs at once. Bio-fuel Medal works well to negate all the debuffs the can do but the Red Life Medal allows you to do an extremely powerful move which should kill them quickly.) (Losing will get you a sex scene that won't be unlocked by the Happy/Bad End).
Go back into the first Hidden Room. Interact with the blue screen (with the Life Red Medal). Go into the newly opened door. Interact with the red crystal and then leave. (Going back and interacting with the person in the room that had the red crystal will get you a sex scene).
Warp to the hospital. Go to the 3rd floor. Enter the room to the left. Interact with the machine that mind-controlled Yuna. Interact with every door in the Health Villain room. Leave.
Go to the Urban area. Go through the double doors that are right next to the right exit of the map. Continue onwards and go through the Health Villain door and the VIP room door. Continue and then you should get the True End.