Yūria "Yusha" Sharudetto is an energetic girl training at an adventurer school, fueled by her dream of becoming a legendary hero. Initially lacking an official adventuring class due to the world's absence of a Demon Lord, she perseveres alongside her friends. Yusha possesses a dim-witted nature contrasted by extraordinary luck and unpredictable actions, often leading to unexpected insight. Her inherent kindness drives an instinctive impulse to aid those in need, motivated solely by her desire for everyone to live happily in peace. This optimism and refusal to give up embody her heroic spirit. Her journey begins concretely during a class challenge within ancient ruins, where she discovers a Hero's sword and uses it to defeat a golem. Taking practical quests often leads to mundane tasks like searching for lost cats. A pivotal moment occurs when she protects and saves her teacher, Mao, from a monster, showcasing her fierce protective instincts. This act earns the admiration of Princess Rona, who officially recognizes Yusha as a hero and transfers to her school. Yusha's compassion extends to diligently nursing Mao back to health when the teacher falls ill. Her strong bond with party members Seira, Fai, and Mei remains central to her growth. She also forms a connection with Chibi Dragon, a tiny dragon that assists her group and unexpectedly consumes powerful entities like the Undersea Demon and the Demon Lord's Maid Golem. Throughout her adventures, Yusha consistently demonstrates her core belief in forging a peaceful world for all.