
I have the feeling that at the end, in order to pass through the gate, you must be "pure", meaning you cannot have your body modified

I think pure isnt about the body being modified. Maybe its the mindset. Definitely not about if u ate someone or killed cause if so then it was a impossible mission from the start. Unless its going for a twisted ending. But maybe the way to reach the peak and get to the end is either sacrificing ur close comrade you bonded with over the countless hardships or finding the team in a sea of people who stab you in the back to get it themselves.
Is this the same author/artist as Casinogui's?
Yep