呪われたブルーム

Five years ago, a boy named Theo lost his hometown and his beloved younger sister to a monster called "Bloom" that suddenly appeared. Swearing revenge, he threw himself into the extermination organization "Jyokai," but he struggled with himself, being constantly saved by his master Lishua as his strength did not match his resolve, despite bearing a cursed mark. Then one day, he met a boy in town...