Original world mc died first then ml did the 5 scripture thingy. Then they keep reincarnating some of the scenes you saw at later chapters came from the other reincarnation where ml died first (which supposed to be their life before the modern one)
There hasn't been any "piss" shown yet. That said, at chapter 6 or 5, seme bought a bottle of alcohol, the same bottle of alcohol shown in chapter 2 or 3. And he, uh, emptied its contents. You get the gist of it, right?
...in a vacuum. But take a step back to the previous chapter and it felt like you jumped through a time machine. This story has ended. But it didn't feel finished.
Jan, ken, guuuuuuuu!!!