Reincarnated Zanpakuto, the School Beauty Who Made the Contract Is the Empress

Reincarnated as a rusty Zanpakutō and given a system that makes you stronger by killing monsters? No, my rusty knife can kill monsters? "Congratulations to the host. Three days ago, a sword-backed mantis stepped on you with its bare feet and you died from the blade of tetanus! Gained kill value: 10!" "Congratulations to the host, you can unlock Zanpakuto attribute 1: Zangetsu!" Lu Xiao fell into deep thought as he looked at Zhan Yue, who was as new as ever after taking off his rust, and was as sharp as a divine weapon. "Remind the host that you can contract with the human race and release Zangetsu's complete state - Tiansuo Zangetsu!" ... My name is Jiang Xuening. I was a human empress in my previous life. I fought and died to protect the human race in the catastrophe of all races. All this was just because the spirit I contracted with was not strong enough. In this life, I must contract with the strongest spirit and reach the top! But fate has played a trick on people. Because she was born too beautiful in this life and had no financial background, she was noticed by a dandy young master. She was drugged and was about to lose her virginity in this deserted mountain and forest. Unwilling to give in, I can only force a temporary contract with a spirit. This spirit is very spiritual. It is... Wait, why is it a broken sword? "Zangetsu? Can you merge with the contractor's sword? That's unheard of! Then give it a try!" Jiang Xuening: "The human sword merges into one, and the sky locks the moon!" The rusty knife in her hand suddenly became slender, and an unstoppable attribute power poured into her body. Jiang Xuening's aura suddenly became cold, and her thin underwear turned into a black outfit. She originally only had the third level of spiritual power, but her spiritual power soared to the ninth level of spiritual power! Jiang Xuening was shocked: "The rusty knife I contracted is so powerful?"