Shifa, a boy who longs for an adventurer, confesses his feelings to his sister Rose, who he respects. Then Rose said, "If you want to be an adventurer, you have to do this much," she imposes her special training on Shifa one after another! Shifa believed the words and tried hard to clear the trials, but Rose's special training also became more radical so that his younger brother would not be in danger when he became an adventurer ... .. A different world adventure fantasy created by a boy who had become ridiculously strong when trained by the strongest Bracon sister! !!