A Century of Sign-Ins, and Millions of Humans Beg Me to Emerge and Slay the Demons

Qin Xuan transmigrates to a parallel world and is thrown into death row from the start. He thinks he is doomed, but awakens a sign-in System. This System is surprisingly thoughtful. 【Scanning the world where the Host is located. Ordinary modern urban world detected.】 【Urban sign-in System starting up...】 【Bzz... Extreme danger warning! Rescanning!】 【The urban world where the Host is located is undergoing a spiritual qi revival!】 【The urban sign-in System cannot guarantee the Host's safety. This System is upgrading...】 【Upgrade complete!】 【This System has been renamed the Cultivation Sign-In System!】 【Sign in to obtain the Chaotic Sacred Body!】 【Sign in to obtain the Nine Heavens Divine Thunder!】 【Sign in to obtain the Heartwood of a Thousand-Year Dragonblood Tree!】 【Sign in...】 Before he knows it, a hundred years have passed. The heavens and earth open wide, and demons descend. Humanity across the globe wails and begs Qin Xuan to emerge from seclusion and slay the demons. Qin Xuan strikes with his sword, annihilating the souls of countless demons! Only then does he realize that he has become invincible in the world.