A Younger Brother Who Had Become Ridiculously Strong After Training as His Sister Told Him to Do

"If you're an adventurer, it's normal to be able to do this much!"

Rose then set Shifa through a series of training exercises, telling him, "If you want to be an adventurer, you have to be able to do this!" Shifa believes Rose's words and tries his best to complete the ordeal. However, Rose's training becomes more and more extreme in order to prevent her brother from being in danger when he becomes an adventurer...