the world zero

The main caracter wakes up like a normal day, his name is hero but is this world, unlike the normal world there are monsters there can be a pet or not, and today hero is going to get a pet he hopes he gets below 30%. when he got the egg, he was excited to see what he got, and when he opened the egg, it was below 0.001 when he saw it he got shocked cause he didn't know it was real and when he touched it he got a system saying "you are the first person to get this achievement unlocked a 100% boost on all stats when he got home he called his friend to know the rarest pet and he responded it was a 2% chance so he asked the system and said what can hatch from the egg "system there are foxes, boars, birds and boarwolfs but it is very rare"