Valentine Nitsune, a young thirteen-year old girl, yearns to explore the world and find her purpose in life. She wants to find happiness for herself and know how it feels; searching for the light that will guide her and on the way, saving someone from an endless darkness as she brings light to his dark world.
Killua Zoldyck, a thirteen-year old boy, who from the moment he was born, was trained to be an assassin. All his life, he has never once felt an ounce of love or pure happiness, his whole world filled to the brim with nothing but darkness. But one day, he finds that light that enters and brightens his once dark and endless void of a world.