In a monochromatic world where survival is determined by strength, our protagonist, known as Lignum Fraxinus, navigates through life as an invisible observer. Amidst the school hierarchy ruled by the dominant Stanrocc. Fraxinus is constantly reminded of his own insignificance. However, his perspective changes when he witnesses a beast terrorizing his school. Fraxinus, though initially hesitant, decides to intervene after encountering Arstria Sirius, the First Star, renowned for her abilities to combat such beasts. Despite his lack of strength, Fraxinus decides to help the girl in defeating the monster.