Leizel, a twenty-five year old office worker suddenly falls into a completely new world, where she has a new family, new acquaintances and strong rivals. When faced with the numerous trials, her only reason to clear them is her dear younger brother whom she had believed to be dead. Monsters, devils and insidious people with intricate plans to bring her down. The obstacles that lay on her path to becoming stronger only increase with her strength, yet she faces them head on without faltering. However, the man she had saved accidentally in her childhood seems to appear whenever she is at the verge of death. A teacher, a friend, a comrade. What more could he be? But it seems like her brother doesn't see him favorably? "Stay away my sister you two faced snake." "Let's runaway together, Zel" "Don't you dare lay a finger on my sister!" 'How did it turn out like this...' Ah. But there's also the lord of elements, who is unusually friendly with her. "Are you uncomfortable anywhere? I guess I should have just taken you away with me instead of letting that idiot take care of you." 'No, why do you all want me to stay with you. I just want to grow stronger?!'