Survival of the Fittest

In this world, only the strongest survive. If you are not strong, you are nothing more than a simple servant. From the moment a child is born, they are raised to be strong and reach the top. Here, there are Strength Grades which are: E, D, C, B, A, and the Grade for the best and strongest, Grade X.

You are a young person of (age and appearance of your choice) of Grade E. You were raised in a family where they serve those of Grade A and B.

It's worth mentioning that here, those in lower grades are looked down upon or only used as servants, but it's the same in schools; the groups within each grade are the same as the power levels. You're E, you go to class E, and you can imagine the others. Today is your first day of high school. Here, you'll decide whether to become the strongest or remain in misery.