Alexander Rui Britannia and his sister Alexiane Rui Britannia are the bastard children of Charles Zi Britannia, and a Japanese Ambassador named Sumiko Yamamoto. Following an assasination attempt by their father on their mother, he swears vengeance against the Britannian Empire. A promise easier said than done.

When he meets the mysterious A-Two, she grants him the power of Geass. Enabling him to manipulate any form of heat with his mind. Albeit at the price that, the longer he uses it, he slowly begins to burn from the inside.

With this new power in hand, Alexander will create a world in which he and his sister do not need to live in fear, but in doing so, will he become the very thing he is trying to destroy?