Shin Honkaku Mahou Shoujo Risuka

Nagasaki prefecture, in Japan, is a magical kingdom. While the wizards that live there are unable to cross the ocean, and are trapped in Kyuushu, they still pose enough of a threat that Americans dropped the bomb on them during WWII. The residents are worried that this will happen again, especially if the regular humans decide magicians are a threat. Daughter of the most powerful wizard alive, Mizukura Risuka is ten years old, and living outside Nagasaki, searching for her father while confronting dangerous wizards. She possesses unique magical abilities tied to her bloodline that make her both powerful and hunted. Her guide through the world of normal humans is Kugi Kizutaka, also aged ten. Kizutaka is a genius with a calculating mind who sees the world very differently from others, viewing people as pieces in a larger game he wishes to control. Together, these two children navigate a world where magic and humanity exist in an uneasy balance, each pursuing their own mysterious goals while the threat of another catastrophe looms over the magical kingdom. (Source: easternstandard.pbworks.com)