[First Book In The Trilogy] Lui Shirosagi is a cold-hearted blader who cares about nothing and no one, except for himself and his bey. But what if he makes an agreement with his enemy? How will his life change? Valt Aoi has a plan for him, but Lui doesn't realise what the Valkyrie blader's doing until it's too late. This plan requires sacrifice, and Lui's more than prepared to make them. But what about everyone else? And why did the wonder boy ask the white tyrant to do it all, anyway?