Asahi Ikusaba was in disbelief – his own sister was stronger than him in this other world?! When Asahi was transported to a new world after an accident, he was thrilled at the prospect of new abilities to discover. However, he quickly discovered that he paled in comparison to the powerful beings around him. It was only his sister, Mayu, who saved him from his despair. Mayu had followed her heart to this same world and was amazed to discover her extraordinary powers and cheat skills. From there, a fantasy-filled adventure started, with the focus on the siblings - one with unyielding love for her brother and the other struggling with feelings of inadequacy.