My Seven Older Sisters All Want to Ruin Me. What Should I Do?

[An invincible wish-fulfillment story. The protagonist isn’t a do-gooder, doesn’t drag things out, and kills decisively.] Jiang Zuocheng returned from the mountains, only to find that everything from his past had changed... And so began his legendary life. Anyone who stands in my way dies, be they man or god! An invincible hero story. He looks down on everything and sweeps all before him! Sky Ninjas? Dead! Ola? Dead! Torrent? Dead! Our mighty Xiawu Nation will sweep across the world! Everything is in my hands, Jiang Zuocheng. With one sword stroke, I cleave the heavens and return all things to nothing! This is pure wish fulfillment. Some details may be a little rough, so please don’t take them too seriously. Just enjoy the ride. Thanks!