Stop! That’s Not How You Use a Master Ball!

It's so frustrating to watch, it's so easy to drive high and low, things that can be solved with a Master Ball, but because the plot is just for the sake of plot, passers-by can be conquered with the Master Ball, but the main characters can't be conquered with the Master Ball, right? Why don't you write their plot? You already have such a system and such an infinitely devouring slime. You can't write anything else! Can't you just keep having fun? Actually, I originally wanted to give it two stars, but after thinking about it I decided against it.

I vomited when I saw it [vomited]

Why don't you catch a slime if you have the Master Ball? It's okay to be the sixth one in front of the stage and the other behind the scenes.