"The ultimate adaptation vial - the best form of where you are!",was wrote on the vial's label. It has a small manual and it said, "This vial changes user's body to the best form to be where you are." Its color didn't look like any other thing she've ever seen. It was very weird and unique, eventually caught Mary's attention.
"What's this? "The ultimate adaptation vial"? How would it work? It changes me?" Mary wondered. "No way. There is no such thing like magical vial. This must be fake. Hm... but it's quite interesting. What if this is real? Anyway, it will be certain after trying this!" Although she didn't think the vial is fake, she decided to try it.
Unlike it seems, it didn't taste anything. And unlike Mary's expectation, nothing happened at all. "So is this fake? Nothing happened! Yeah it must be someone's trick." She finally thought it is fake and trick, but it wasn't. Mary's body was already best form to be in her house.
This vial can transform to different animals depends on what are you doing and where you are. For example, being in hot place will turn you into tropical animal, and being in cold place will turn you into artic animal. If you are inside of water, you will be a fish. If you are running, you will be faster animal. Eating vegetable will make you a herbivore, and meat makes predator animal.