Reincarnated as the Villainess's Unlucky Bodyguard - Chapter 80: Serve as your villainous sidekick

Lenny, an orphan from the Sector 41 slums, suddenly finds himself in possession of a rare and unknown affinity. It allows him to upgrade himself, using energy acquired from spirit beasts. But will he gain enough power to defend himself against those with every advantage he has never known?Explore the Western Alliance, where the Four Pillars rule supreme, and all vie for the title of the strongest faction. But when those sworn to protect the people fight amongst themselves, who will save them from the biggest threat they've ever known? And can one young boy, with no family and a handful of friends, survive all that chaos?

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

While the demons were rising, mankind was about to become extinct. Six temples rose and protected the last territory of mankind.