This is actually good. 8/10
Nothing outstanding aside from the title being a synopsis and the battle belonging more to the background.
The need to pee adds urgency and excitement to what would have been otherwise a boring and plain fight.
Don't bother to read this if you're not here for the piss humour.
No this isn't about a piss fetish or anything.
Ok some panels are actually quite cute ngl.
This could've been a oneshot in my opinion with only 3 or 4 pages per chapter.
And yet within these 20-something pages we got a fairly entertaining and short story.
In my opinion they should've found out because of the smell and nature of urine. I guess the creator forgot about that or they wanted to focus on the funny.
It's also possible that the piss really did have some holy attribute which could've contributed to the demon lord's demise and explain the lack of smell. Honestly I kinda think so because the guy didn't look that strong physically. Like his teeth didn't even scratch her. I think he put all his points into magic and that made him extremely vulnerable to the piss. Also he sounded like he knew holy water was his weakness.
And this makes the last chapter make more sense because that amount of "holy water" is probably rare.
Moral of the story: don't wait to go. Y'know, like before a battle or something.