SSS Rank Sword Mage: Awakening Starts with Weakest Mana Affinity

Getting hit by a truck? Fine.But reincarnated with the weakest mana core? Seriously?Whatever. This will have to do.Now, I just need to find a way to make this so-called worthless affinity work. Once I've mastered it, I'll hunt down the one who wanted me dead from the very beginning. I don't care how powerful they areI will fight for my right to live.Sword-mage?Yeah that has a nice ring to it.Features:Underdog grind to greatnessSmart, strategic MC (male)Sword-magic hybrid combatKingdom buildingElves, beastkin, and magesBeast taming [dragons, snakes,turtles, lizards, koi fish and toads]magical toolsHard magic system with rulessurvivala bit of haremTwin female lead (sister)Story's Pacing : moderate