I in part agree, in part disagree with Harleyquin13.
For all the smokescreen, this game is actually a visual novel. What's worse, far over 80% of it are omakes.
I mean, given what two people claiming to know Japanese said, if it were in English, it would likely be puntastic, but it ain't and it's still just an VN with very little plot.
If you know the language, it's likely quite funny, if not though,...
The reason, why I see it as one, is because if you took enough time to completely grind the tree after first battle (granted, it took about 24 hours, still...) and sprinkle some item world grind for initial equipment, all the battles (at least on Normal) become trivial (except for the ones that are unwinnable by design). Even that early hard boss (that is supposedly giving you a pass even if you fell to it) falls quickly. What's more, there doesn't seem to be an in-game feature to track which specials originate from which weapons, not that you'll need them on Normal, given above.
Also, all the H elements seem to be added with no plot reasons at all, besides perhaps a Pokemon one.
Just for completeness: any chance that early boss is the true end switch ?