Anime: I Want Harem - Chapter 53

Xuanqian Continent, where sects stood in great numbers and experts abounded.The youth, Zhou Heng, with a mysterious black Broken Sword in his Dantian, emerged from Origin Stone Town and fought his way to claim a piece of the world in this grand era.To the exceedingly wicked, kill!To those who bullied my friends and family, kill!To those who obstructed my path to enlightenment, kill!On the path to the heavens, I tread with songs, with a sword in hand, I alone am honored under the heavens!

In the celestial empire, during the ninth year of the Mandate of Heaven,Chaos reigns across the land, and the people suffer.The royal governance collapses, and western barbarians with their pantheon of gods invade.New warlords arise, claiming territories; the Taiping rebels wreak havoc, leading to widespread misery.Calamities like floods, droughts, earthquakes, sandstorms, tornadoes, acid rain, blood moons, and meteor falls occur in succession.Countless demons roam, strange beings thrive, spirits mingle with the inexplicable, and mysterious phenomena arise.In these dark and tumultuous times, Tao Qian opens his eyes to find himself about to be beheaded at the vegetable market...

In a world teeming with Titans, Colossals, Gigantic Monsters and Kaiju's, Erian who reincarnated makes his living collecting scraps of low-grade Defective Genetic Serum, realised he transmigrated along with his system.

Follow Erian as he grows to become the strongest Disaster Grade Titan with the help of his Titan System!

She, a modern hidden ghost leader of an organization which gathered insane prodigies proficient in the various differing skill-sets. Highly skilled in medicine and poison, executes covert assassinations, viewed as insane and demonic in the eyes of people of the world. Killed in an accident, and reborn into the body of a disfigured young girl.

What? Face disfigured, identity stolen? A return to the family dim and hopeless? Her identity can be given up, her family can be forgone, but as for the one who harmed her predecessor who inhabited this same body, if she didn’t at least make them scream in unimaginable agony and throw them into a state of wretchedness, how could she live up to her demonic reputation? Endless turmoil ensues and it’s a battle to dominate over all! See how she shook the world dressed in a suit of red, her sword up against the dominant powers that rocked the Heavens! Her name spread across the seas, shocking the earth!

- Description from Novelupdates