Beast Taming: Summoning an SSS-Rank Girl from the Start

This is a world of beast tamers! Some summon mighty five-clawed golden dragons that soar through the skies, looking down on all creation. Others summon black tortoises to guard the frontiers, slay evil spirits, and protect the borders... I, Lu Xuan, was a fallen prodigy. On the day I awakened, I accidentally summoned a tiny skeleton. Who could have guessed that the little skeleton was actually the God of Death? And the God of Death was a girl! Others tame beasts. I command gods!