Help find a horror manga

I need help finding a horror manga I read before. The only thing I remember is people like tons of people being kidnapped they arrive in a facility in like those huge pick up trucks like for industrial use trucks. And they're fed to something, alien ig. Then, they there's a department where like caged women are fucked to get impregnated and shit, basically mind break. And the golden child/MC(not the character that we follow) is birthed by one of the woman there. The MC is like the perfect speciment for them because he regenerate constantly and quickly. The MC we followed befriended the golden child MC. The ending was they golden child MC sacrificed himself and the MC we followed got back to his normal life but turns out the golden child MC is still alive and they reunited.